Food cravings: causes and what stops them
Food cravings are usually a signal, not a lack of willpower. The blood sugar rollercoaster, sleep loss, stress and heavily processed food are the most common drivers. What the evidence says and which directions can make the pull smaller.
Almost everyone who comes to me struggling with their weight knows this sentence: „I simply have no discipline." I see it differently. In the vast majority of cases, a craving is not a character flaw, but a signal. Your body is reporting that something is out of rhythm: blood sugar is riding a rollercoaster, sleep was too short, stress too high, the diet too strict or the food too heavily processed. When you know these drivers, you stop fighting against yourself. You start turning the right dials. In this text we go through where cravings really come from and which directions can stop them.
This spoke belongs to the weight cluster. We look at what a craving actually is, why it is mostly a biological signal, which five drivers are best documented (blood sugar, sleep, stress, restriction, processed food), what the studies show, which directions can dampen the pull and when you should have things checked by a doctor. This is not about a recipe, but about understanding and about levers you hold in your own hands.
A craving is a signal, not a lack of willpower
Imagine the moment: it is 4 pm, you actually had lunch, and yet you are pulled with almost physical force toward the drawer with the biscuits. Or it is late in the evening, the day was long, and suddenly there is this pull toward chocolate that cannot be thought away. Many people experience this as a personal failure. Yet it is mostly biology.
A craving is a sudden, targeted urge to eat, often for something sweet or high in carbohydrates. It differs from calm, gradual hunger. It comes quickly, feels urgent and aims at specific foods. Exactly this pattern reveals that signalling pathways are at work here: blood sugar, hormones, the stress system and the reward system in the brain. That is not a reason for resignation in the sense of „then I can do nothing". On the contrary: because these are signalling pathways, you can influence them.
A craving is not a lack of willpower. It is the language of your body when blood sugar, sleep, stress or food quality have slipped out of rhythm. Whoever reads the signals does not have to fight against themselves. They can address the causes.
Driver 1: the blood sugar rollercoaster
Probably the most underrated driver is the course of your blood sugar after eating. For a long time people thought the height of the blood sugar spike mattered most. A large study with continuous glucose sensors flipped the picture. Not the spike, but the crash afterwards seems to predict the next hunger.
The pattern is simple: you eat something quickly available, for example white bread with jam. Blood sugar shoots up. The body responds with a lot of insulin. The insulin pushes the sugar out of the blood so vigorously that the value can fall below the starting point 2 to 3 hours later. This dip signals energy shortage to the brain, even though you just ate enough. And you reach for something sweet again. The rollercoaster starts over.
The glucose dip predicts hunger
Cohort study, n=1070 Patrick Wyatt, Sarah Berry and colleagues studied 1070 healthy people in 2021 in Nature Metabolism with continuous glucose sensors, who ate over 8,600 standardised and more than 71,000 free meals. Result: the glucose dip 2 to 3 hours after the meal predicted later hunger, the shorter interval to the next meal and energy intake better than the glucose spike. Those with large dips ate noticeably more over 24 hours on average. Important context: these are associations, not proven causes, and the correlations are moderate. But they were consistent across two separate groups.
Wyatt P, Berry SE, Finlayson G, et al. Nat Metab. 2021;3(4):523-529. doi:10.1038/s42255-021-00383-x · PMID: 33846643
What these data document is therefore: the blood sugar crash after a spike is linked to more hunger. What follows as a direction? Build meals so that blood sugar rises more slowly and falls more gently. Protein, fibre and fat slow the uptake. They can flatten the rollercoaster. To be honest, one limitation belongs here: in healthy, normal-weight people, small differences in blood sugar over the day often matter less than people think.
Not every small blood sugar difference counts
RCT Alice Rosi and colleagues tested in 2018 in the Journal of Nutrition, in 15 healthy, normal-weight men, whether different breakfasts with a different glycaemic index change food intake later in the day. Result: the breakfasts affected blood sugar and satiety in the short term, but had little effect on food choice and total intake across the day. This is a caution: blood sugar is one factor, but not the only one. In people with disturbed blood sugar regulation it can matter more.
Rosi A, Martini D, Scazzina F, et al. J Nutr. 2018;148(10):1536-1546. doi:10.1093/jn/nxy160 · PMID: 30204905
Driver 2: too little sleep
Do you know the feeling of eating all day after a short night and still not getting full? That is not imagination. Sleep loss measurably shifts the hormones that steer hunger and satiety. Two of them are decisive: leptin, which reports satiety, and ghrelin, which reports hunger.
Short sleep, more ghrelin, more hunger
RCT, crossover, n=12 Karine Spiegel and Eve Van Cauter showed in 2004 in the Annals of Internal Medicine, in 12 healthy young men under controlled conditions: after two nights of sleep restriction the satiety hormone leptin fell by about 18 percent, the hunger hormone ghrelin rose by about 28 percent, hunger increased by 24 percent and appetite by 23 percent. The desire for calorie- and carbohydrate-rich food rose especially strongly, by 33 to 45 percent. Short sleep therefore shifts the hunger hormones exactly in the craving direction.
Spiegel K, Tasali E, Penev P, Van Cauter E. Ann Intern Med. 2004;141(11):846-850. doi:10.7326/0003-4819-141-11-200412070-00008 · PMID: 15583226
That this effect does not only occur in the lab was shown by a large population sample. Taheri and colleagues found in 2004 in PLoS Medicine, in over 1000 people of the Wisconsin Sleep Cohort: those who habitually slept short had lower leptin, higher ghrelin and a higher body mass index. And Brondel and colleagues translated this in 2010 in the American Journal of Clinical Nutrition into behaviour: a single night with 4 instead of 8 hours of sleep led to about 22 percent more energy intake the next day.
One short night, 22 percent more eating
RCT, crossover, n=12 Laurent Brondel and colleagues had healthy men sleep in a randomised study once for about 8 hours and once for about 4 hours. The day after, they were free to eat. After the short night they ate on average 559 kilocalories more, that is about 22 percent. Hunger before breakfast and before dinner was clearly higher. So even a bad night can push appetite up noticeably.
Brondel L, Romer MA, Nougues PM, Touyarou P, Davenne D. Am J Clin Nutr. 2010;91(6):1550-1559. doi:10.3945/ajcn.2009.28523 · PMID: 20357041
What is interesting is what the hunger targets. A randomised study in 105 children (Morrison 2023, American Journal of Clinical Nutrition) showed that milder sleep shortening increased in particular the consumption of energy-dense and ultra-processed food, and that more was eaten out of emotion than out of real hunger. Sleep loss and cravings for exactly the wrong things therefore belong together.
„If I have cravings in the evening, I lack self-control." Often it is sleep that is lacking. After a short night your hunger hormones are shifted (Spiegel 2004), and the reach for sweets is then not a character problem but a hormonal reaction. The first step against evening cravings sometimes lies in the night before.
Driver 3: stress and cortisol
Stress and eating are tightly wired together. Whoever is under pressure often reaches not for the apple but for the chocolate. This too has a biological basis. Under stress the body activates the stress axis and releases, among others, cortisol. Cortisol and the reward system of the brain work together here.
How stress amplifies the desire for sweet and fatty food
Mechanism review Rajita Sinha and Ania Jastreboff summarised in 2013 in Biological Psychiatry how the biology of stress and that of appetite overlap. High stress changes eating behaviour and increases the consumption of highly palatable food. This in turn raises the incentive value of these foods in the reward system, a self-reinforcing cycle. Through dopamine and the stress circuits, the motivation to eat exactly these foods grows. Stress cravings are therefore mechanistically well understandable.
Sinha R, Jastreboff AM. Biol Psychiatry. 2013;73(9):827-835. doi:10.1016/j.biopsych.2013.01.032 · PMID: 23541000
That this also shows up in numbers on weight was demonstrated by a prospective study. Chao and colleagues followed 339 people over six months in 2017 in the journal Obesity. Higher cortisol, higher insulin and higher chronic stress at the start predicted later weight gain. And a higher ghrelin level was linked to more cravings. A smaller study (Rosenberg 2012) found a higher desire for sweets after a standardised stress test, which was linked to the cortisol response.
Stress and cortisol predict weight gain
Cohort study, prospective, n=339 Ariana Chao, Rajita Sinha and colleagues studied 339 adults over six months in 2017 in Obesity. Those who had higher morning cortisol, higher insulin and more chronic stress at the start were more likely to gain weight in the following months. A higher ghrelin level was linked to stronger food cravings. The authors concluded that stress hormones and reward-driven eating can play a role in weight gain. This suggests: stress regulation is part of the work against cravings.
Chao AM, Jastreboff AM, White MA, Grilo CM, Sinha R. Obesity (Silver Spring). 2017;25(4):713-720. doi:10.1002/oby.21790 · PMID: 28349668
Driver 4: too much restriction
The reflex with cravings is often the opposite of helpful: becoming even stricter, banning the forbidden thing even harder. Exactly this can fuel the craving. That is one of the core ideas of this text: „just eat half" is rarely the right lever.
Banning increases the desire for the banned
RCT Jennifer Coelho, Janet Polivy and Peter Herman had people randomly restrict either carbohydrates or proteins for three days in 2006 in the journal Appetite, with a control group without restriction. Result: the restriction specifically increased the desire for exactly the withheld category. Those who avoided carbohydrates developed more desire for carbohydrates and later also ate more of them. Strict bans can therefore amplify a craving rather than erase it.
Coelho JS, Polivy J, Herman CP. Appetite. 2006;47(3):352-360. doi:10.1016/j.appet.2006.05.015 · PMID: 16844265
On top of that comes a second point. Very strong, lasting calorie restriction can put the body into a state that fuels hunger and cravings. The body responds to persistent shortage with adaptation. More sustainable than the pure less is a way of eating that fills you up and keeps blood sugar steady. It is not the amount alone that counts, but the quality and the hormonal effect of the food. Enough protein, enough fibre, real food.
More bans do not automatically mean fewer cravings. Often it is the opposite. Whoever fills themselves up instead of punishing themselves gives the body less reason to go into alarm mode. Quality and satiety beat pure calorie halving.
Driver 5: ultra-processed food
Not only how much you eat, but what, changes your hunger. Ultra-processed foods, that is industrially heavily processed products with many additives, affect appetite and the reward system differently than real, minimally processed foods. The strongest evidence for this comes from an inpatient study under controlled conditions.
Processed food, 508 calories more per day
RCT, crossover, inpatient, n=20 Kevin Hall and colleagues had 20 adults eat, in 2019 in Cell Metabolism, alternately two weeks of ultra-processed and two weeks of unprocessed food in an inpatient setting. The meals were matched for calories, energy density, sugar, fat, salt and fibre. Everyone was allowed to eat as much as they wanted. On the ultra-processed diet the participants ate on average 508 kilocalories per day more and gained weight (about 0.9 kilograms), on the unprocessed diet they ate less and lost weight. Same nutrients, different eating behaviour.
Hall KD, Ayuketah A, Brychta R, et al. Cell Metab. 2019;30(1):67-77.e3. doi:10.1016/j.cmet.2019.05.008 · PMID: 31105044
Why is that? Ultra-processed foods are usually energy-dense, quick to eat, low in fibre and strongly optimised for palatability. LaFata and Gearhardt discussed in 2022 in Psychotherapy and Psychosomatics that such foods strongly affect the reward system and can favour addiction-like patterns in eating behaviour. That is still under scientific discussion, but the direction is clear: the more real your food, the more honestly your body reports when it is full.
Keep blood sugar steady
Protein, fibre and some fat at each meal may soften the sharp blood sugar dip that predicts the next hunger (Wyatt 2021). This is a direction, not a guarantee.
Prioritise sleep
Enough sleep can keep the hunger hormones in balance. Even a short night shifts leptin and ghrelin (Spiegel 2004) and can raise intake (Brondel 2010).
Regulate stress
Movement, breathing, breaks and social connection can calm the stress axis. Stress can amplify the desire for sweet and fatty food through cortisol (Sinha 2013, Chao 2017).
Choose real food
Minimally processed foods often fill you up with fewer calories. Ultra-processed food can lead to markedly higher intake (Hall 2019).
The four lenses on cravings
From the perspective of clinical psychoneuroimmunology, it is worth seeing cravings through several lenses. They do not replace one another, they complement each other. This makes it understandable why a single tip rarely suffices.
Nervous system and reward
Sweet and fatty foods activate the dopaminergic reward system. Under stress the incentive value of these foods grows stronger (Sinha 2013). A craving is partly a learning and reward phenomenon, not pure stomach hunger.
Metabolism and blood sugar
The blood sugar course after eating helps steer when the next hunger comes. The dip after a spike predicts hunger and intake (Wyatt 2021). Protein and fibre can smooth the curve.
Hormonal system
Leptin and ghrelin steer satiety and hunger. Sleep loss and stress shift these hormones toward more appetite (Spiegel 2004, Chao 2017). The body then reports hunger even though enough energy is present.
Immune system and silent inflammation
A persistent, low-grade inflammation, for example from sleep loss, visceral fat and heavily processed food, is linked to disturbed appetite and insulin regulation. This can maintain the cycle of hunger and storage.
What usually does not work against cravings
An honest look at the advice that promises much and delivers little belongs here.
- Just pull yourself together. Cravings are mostly biologically driven. Pure willpower against shifted hormones and blood sugar crashes usually loses in the long run. It makes more sense to address the causes.
- Ban all sweets harshly. Strict bans can increase the desire for the banned rather than erase it (Coelho 2006). Conscious, satisfying enjoyment often beats the complete ban.
- Look only at calories. The same calories do not act the same. Ultra-processed food can lead to markedly higher intake at identical nutrients (Hall 2019). Quality counts too.
- Ignore sleep and stress. Whoever only optimises nutrition but sleeps too little and is chronically stressed is fighting their own hormone state. Sleep and stress are not side issues.
A craving is not an enemy, but feedback
When you stop fighting the craving as a weakness and start reading it as a signal, everything changes. Then the question is no longer „why am I so undisciplined", but „what is my body missing right now". That question you can answer.
Three levers you can try this week
Build protein and vegetables into every main meal
A good protein source and fibre may soften the sharp blood sugar dip that predicts the next hunger (Wyatt 2021). When the next hunger comes later and milder, the craving has less to grip onto.
Protect your sleep like an appointment
Enough sleep can keep the hunger hormones in balance. Even a short night can markedly raise appetite the next day (Spiegel 2004, Brondel 2010). A fixed bedtime is an underrated lever against evening cravings.
Build in a short stress pause before reaching for sweets
When the pull comes, sometimes one minute helps: briefly step outside, a few deep breaths, a glass of water. Stress can drive the desire through cortisol (Sinha 2013). A conscious pause can interrupt the automatism.
If your craving is new, very strong or accompanied by other signs, please have it checked by a doctor. Warning signs are strong sudden hunger with trembling, sweating and a racing heart (suspicion of low blood sugar, especially with diabetes), constant hunger with thirst and frequent urination, or cravings in the context of an eating disorder. This text serves information and does not replace a medical examination, diagnosis or treatment.
Frequently asked questions about cravings
What is a food craving and what causes it?
A food craving is a sudden, often hard to ignore urge to eat, usually aimed at something sweet or high in carbohydrates. It is mostly a biological signal, not a lack of willpower. Common drivers are a blood sugar rollercoaster (a spike followed by a dip), sleep loss, stress and cortisol, overly strict dieting and ultra-processed food that strongly activates the reward system. Wyatt 2021 showed in Nature Metabolism, in 1070 people with glucose sensors, that the glucose dip 2 to 3 hours after a meal predicts later hunger and energy intake better than the spike itself. When you know the drivers, a craving looks less like a personal failure and more like a signal you can influence.
How can I stop food cravings?
There is no guarantee, but several directions may dampen cravings. First, keep blood sugar steadier: protein and fibre at each meal may soften the sharp dip after the spike (Wyatt 2021). Second, prioritise sleep, because sleep loss shifts the hunger hormones (Spiegel 2004, Brondel 2010). Third, regulate stress, because stress can amplify the desire for highly palatable food through cortisol and the reward system (Sinha 2013, Chao 2017). Fourth, choose real, minimally processed foods (Hall 2019). Fifth, do not restrict too harshly, because strict bans can increase craving for the forbidden food (Coelho 2006). These levers work together, not in isolation.
Why do I get cravings in the evening?
Evening cravings often have several reasons at once. If you eat too little or too irregularly during the day, you make up the calorie need in the evening. A day full of blood sugar spikes and dips can leave you hungry by evening (Wyatt 2021). Stress that builds over the day often discharges in the evening reach for chocolate, because highly palatable food can be briefly calming (Sinha 2013). And sleep loss from the previous night shifts the hunger hormones toward more appetite, especially for carbohydrate-rich food (Spiegel 2004). If you eat enough protein and real food during the day and deliberately wind stress down, the evening pull can often get smaller.
Why do I crave sweets?
Sweets are quickly available energy and strongly activate the reward system in the brain. After a carbohydrate-rich meal, blood sugar can first shoot up and then fall below the starting value. This dip signals energy shortage to the brain, even though you just ate enough, and you reach for something sweet again (Wyatt 2021). Under stress the desire for sweets rises further, which is measurable after acute stress in studies (Rosenberg 2012). Sleep loss specifically increases appetite for calorie- and carbohydrate-dense food (Spiegel 2004). The wish for sweets is therefore rarely pure greed, but often an interplay of blood sugar, stress and sleep.
Does sleep loss cause cravings?
Sleep loss can markedly increase hunger and cravings. Spiegel 2004 showed in a randomised study that after sleep restriction the satiety hormone leptin fell by about 18 percent, the hunger hormone ghrelin rose by about 28 percent, and hunger and appetite increased, especially for calorie- and carbohydrate-rich food. Taheri 2004 found the same hormone direction in a population sample of over 1000 people. Brondel 2010 showed that a single night with 4 instead of 8 hours of sleep led to about 22 percent more energy intake the next day. Enough sleep is therefore one of the underrated levers against cravings.
How are stress and cravings connected?
Stress activates the stress axis and releases, among others, cortisol. Sinha 2013 describes in a review how stress amplifies the incentive value of highly palatable food through the reward system and increases the motivation to eat exactly those foods. Chao 2017 found in a prospective study of 339 people that higher cortisol, higher insulin and chronic stress predicted later weight gain. Rosenberg 2012 showed a higher desire for sweets after a standardised stress test, which was linked to the cortisol response. Stress cravings are therefore biologically understandable. Stress regulation, movement and sleep can counteract this.
Do strict diets make cravings worse?
Very likely yes. Coelho 2006 showed in a randomised study that three days of selective restriction of carbohydrates or proteins specifically increased the desire for exactly the withheld category. So if you harshly ban sweets, you may amplify the craving for sweets rather than erase it. On top of that, very strong calorie restriction can lower the resting metabolic rate and put the body into a state that fuels hunger and cravings. More sustainable than bans is usually a way of eating that fills you up and keeps blood sugar steady, with enough protein and fibre. It is not the amount alone that counts, but the quality and hormonal effect of the food.
Does ultra-processed food play a role in cravings?
Yes, ultra-processed food appears to play a special role. Hall 2019 had people in an inpatient randomised study eat alternately two weeks of ultra-processed and two weeks of unprocessed food, matched for calories, sugar, fat and fibre. On the ultra-processed diet the participants ate about 508 kilocalories per day more and gained weight. LaFata and Gearhardt 2022 discuss that ultra-processed foods strongly affect the reward system and can favour addiction-like patterns. Real, minimally processed foods, by contrast, often fill you up with fewer calories. This is one of the most effective levers against cravings.
Is a sudden craving a warning sign of illness?
Most of the time cravings are harmless and explainable by everyday factors. In some cases, though, a craving can be a hint. Very strong, sudden hunger with trembling, sweating and a racing heart can indicate low blood sugar, especially with diabetes and insulin therapy. Constant, barely satisfiable hunger with thirst and frequent urination should be medically checked. Thyroid disorders, hormonal changes and certain medications can also change appetite. If your craving is new, very strong or accompanied by other symptoms, please have it checked by a doctor. This text does not replace a medical examination.
Does more protein help against cravings?
Protein may help dampen cravings, even though it is no miracle cure. Protein usually fills you up more strongly and for longer than the same amount of carbohydrates, and it also softens the sharp blood sugar dip after a meal. Since exactly this dip predicts later hunger (Wyatt 2021), a higher-protein, fibre-rich meal may soften the next craving wave. Important context: in healthy normal-weight people, small differences in blood sugar over the day often matter less (Rosi 2018). The practical advice stays the same: build a good protein source and vegetables into every main meal, then the next hunger usually comes later and milder.
Connections to other topics
How leptin, ghrelin and the satiety system interact and why your body can steer hunger and satiety itself.
How to flatten the rollercoaster that helps drive cravings, with meal order, protein and fibre.
Why insulin and leptin are the real pacemakers of storage and hunger, and what resistance does to them.
How too little sleep shifts the hunger hormones and slows the path to your goal weight.
Why the same calories do not act the same and how the quality of your food steers your hunger.
Sources and further reading
- Wyatt P, Berry SE, Finlayson G, et al. Postprandial glycaemic dips predict appetite and energy intake in healthy individuals. Nat Metab. 2021;3(4):523-529. doi:10.1038/s42255-021-00383-x · PMID: 33846643 [Cohort]
- Spiegel K, Tasali E, Penev P, Van Cauter E. Brief communication: Sleep curtailment in healthy young men is associated with decreased leptin levels, elevated ghrelin levels, and increased hunger and appetite. Ann Intern Med. 2004;141(11):846-850. doi:10.7326/0003-4819-141-11-200412070-00008 · PMID: 15583226 [RCT]
- Taheri S, Lin L, Austin D, Young T, Mignot E. Short sleep duration is associated with reduced leptin, elevated ghrelin, and increased body mass index. PLoS Med. 2004;1(3):e62. doi:10.1371/journal.pmed.0010062 · PMID: 15602591 [Cohort]
- Brondel L, Romer MA, Nougues PM, Touyarou P, Davenne D. Acute partial sleep deprivation increases food intake in healthy men. Am J Clin Nutr. 2010;91(6):1550-1559. doi:10.3945/ajcn.2009.28523 · PMID: 20357041 [RCT]
- Morrison S, Jackson R, Haszard JJ, et al. The effect of modest changes in sleep on dietary intake and eating behavior in children: secondary outcomes of a randomized crossover trial. Am J Clin Nutr. 2023;117(2):317-325. doi:10.1016/j.ajcnut.2022.10.007 · PMID: 36863827 [RCT]
- Sinha R, Jastreboff AM. Stress as a common risk factor for obesity and addiction. Biol Psychiatry. 2013;73(9):827-835. doi:10.1016/j.biopsych.2013.01.032 · PMID: 23541000 [Mechanism Review]
- Chao AM, Jastreboff AM, White MA, Grilo CM, Sinha R. Stress, cortisol, and other appetite-related hormones: Prospective prediction of 6-month changes in food cravings and weight. Obesity (Silver Spring). 2017;25(4):713-720. doi:10.1002/oby.21790 · PMID: 28349668 [Cohort]
- Rosenberg N, Bloch M, Ben Avi I, et al. Cortisol response and desire to binge following psychological stress: comparison between obese subjects with and without binge eating disorder. Psychiatry Res. 2012;208(2):156-161. doi:10.1016/j.psychres.2012.09.050 · PMID: 23083917 [Case-Control]
- Coelho JS, Polivy J, Herman CP. Selective carbohydrate or protein restriction: effects on subsequent food intake and cravings. Appetite. 2006;47(3):352-360. doi:10.1016/j.appet.2006.05.015 · PMID: 16844265 [RCT]
- Hall KD, Ayuketah A, Brychta R, et al. Ultra-Processed Diets Cause Excess Calorie Intake and Weight Gain: An Inpatient Randomized Controlled Trial of Ad Libitum Food Intake. Cell Metab. 2019;30(1):67-77.e3. doi:10.1016/j.cmet.2019.05.008 · PMID: 31105044 [RCT]
- LaFata EM, Gearhardt AN. Ultra-Processed Food Addiction: An Epidemic? Psychother Psychosom. 2022;91(6):363-372. doi:10.1159/000527322 · PMID: 36349805 [Review]
- Rosi A, Martini D, Scazzina F, et al. Nature and Cognitive Perception of 4 Different Breakfast Meals Influence Satiety-Related Sensations and Postprandial Metabolic Responses but Have Little Effect on Food Choices and Intake Later in the Day in a Randomized Crossover Trial in Healthy Men. J Nutr. 2018;148(10):1536-1546. doi:10.1093/jn/nxy160 · PMID: 30204905 [RCT]