Have you ever noticed this pattern?
You grab a muffin or pastry with your morning coffee, feel energised for an hour, then suddenly you're tired, hungry and searching for something sweet again. By mid-afternoon you're reaching for chocolate or biscuits, and the cycle repeats itself.
This is what's often referred to as the blood sugar rollercoaster.
When we eat foods high in refined carbohydrates or sugar without enough protein, fibre or healthy fats, blood glucose rises quickly. In response, the pancreas releases insulin to move glucose from the bloodstream into our cells, where it can be used for energy.
If blood sugar rises rapidly, it can also fall more quickly afterwards. For some people, this drop can leave them feeling tired, irritable, hungry and craving another quick source of energy, often sugary foods. While everyone's response is different, repeatedly choosing highly refined foods can make it harder to maintain steady energy and appetite throughout the day. (7)
The encouraging news is that sugar cravings aren't just about what you eat. Factors such as stress, sleep, restrictive dieting and meal composition all influence your blood sugar and the hormones that regulate hunger.
Here is 5 common reasons your body may be asking for sugar.
1. You're Stressed
What's happening?
When you're stressed, your body releases cortisol, yep this is the "stress hormone." Cortisol prepares your body to respond to a challenge by making more energy available, increasing appetite and, in many people, heightening the appeal of foods that are high in sugar and fat.
Stress can also make us more likely to skip meal preparation, eat on the go or seek comfort foods that provide temporary pleasure. (1)
This is why cravings often feel strongest during busy work periods, family pressures or emotional challenges. A ‘piece of chocolate’ turns into the whole bar when you’re opening it near the laptop and ‘let’s just order a pizza’ becomes the quick solution when you’ve got a lot of work to do.
What to do
We know ‘eliminating stress’ isn't realistic, as much as we try. So instead, supporting your body through stressful periods can help reduce cravings.
Ensure to:
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Eat regular, balanced meals.
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Include protein with each meal.
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Take short movement breaks during the day.
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Practise stress-management techniques that work for you, such as mindfulness, breathing exercises or a walk outside.
What the evidence says
Research suggests chronic stress and elevated cortisol can influence food preferences, increasing the desire for highly palatable, energy-dense foods. So it’s not willpower to blame when you’re reaching for another chocolate bar, but our reaction to stress instead.
2. You're Not Eating Enough Protein
What's happening?
Protein is one of the most satisfying nutrients. It slows digestion, helps stabilise blood sugar and supports the hormones that regulate appetite.
When meals are low in protein, hunger often returns sooner and suddenly, increasing the likelihood of reaching for sugary snacks. (4)
Many people unknowingly eat very little protein at breakfast, making them more vulnerable to mid-morning and afternoon cravings.
What to do
Aim to include a quality source of protein at every meal.
Examples include:
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Eggs
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Greek yoghurt
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Cottage cheese
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Fish
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Chicken
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Tofu
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Lentils
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Beans
A protein-rich breakfast can be particularly effective in reducing cravings later in the day.
What the evidence says
Research consistently shows that higher-protein meals improve satiety and may help reduce overall calorie intake by keeping people fuller for longer.
3. The Way You Think About Food Matters More Than You Think
What's happening?
Sugar cravings aren't driven by physiology alone; they're also influenced by psychology.
Your brain and digestive system are in constant communication through what's known as the gut-brain axis. This network allows the brain, gut, nervous system, hormones and even your gut bacteria to exchange information throughout the day.
When you're stressed, anxious or feeling guilty about food, your body doesn't simply experience those emotions mentally. Stress activates the sympathetic nervous system (your "fight or flight" response), increasing the release of cortisol and adrenaline. (2)
In the short term, this can:
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Slow digestion.
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Alter gut motility, sometimes causing bloating or digestive discomfort.
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Increase appetite for quick, energy-dense foods.
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Make highly palatable foods feel more rewarding.
Many people also fall into an unhelpful cycle of food rules and negative self talk.
You might tell yourself:
"I shouldn't eat chocolate."
"I've been good all week."
"I've ruined my diet."
Ironically, the more we tell ourselves we can't have something, the more attention our brain gives it.
Psychologists call this dietary restraint. Research has shown that rigid food rules can increase food preoccupation and make overeating more likely when those rules are eventually broken. (6)
This is why a single biscuit can sometimes turn into half a packet - not because you lack willpower, but because your brain has shifted into an "I've already failed, so I might as well keep going" mindset.
What to do instead
Rather than aiming for perfection, aim for flexibility.
Try replacing restrictive food rules with a more balanced approach:
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Include enjoyable foods alongside nourishing meals.
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Avoid labelling foods as "good" or "bad."
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Eat mindfully and without guilt where possible.
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Notice your thoughts around food without judging them.
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Focus on what you can add to your diet rather than what you need to eliminate.
A healthy relationship with food isn't about perfect choices - it's about consistent habits and self-compassion.
What the evidence says
Research on the gut-brain axis shows that communication between the brain and digestive system is bidirectional, meaning psychological wellbeing can influence digestive function, while the gut can also influence mood and behaviour. Studies on dietary restraint have also found that rigid restriction often increases cravings and episodes of overeating, whereas a more flexible approach to eating is associated with healthier long-term outcomes. (2)
4. You're Not Getting Enough Sleep
What's happening?
One poor night's sleep can affect far more than your concentration - it can also increase your appetite.
Sleep deprivation alters the hormones that regulate hunger, increasing ghrelin (which stimulates appetite) and decreasing leptin (which signals fullness). As a result, you're more likely to crave quick sources of energy, particularly foods high in sugar and refined carbohydrates.
When you're tired, your brain also becomes more responsive to rewarding foods, making that chocolate bar or pastry much harder to resist. (8)
What to do
Aim for 7–9 hours of quality sleep most nights where possible.
Good sleep habits include:
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Keeping a consistent bedtime.
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Reducing screen time before bed.
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Limiting caffeine later in the day.
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Eating balanced meals that provide sustained energy throughout the day.
Improving sleep won't eliminate cravings overnight, but it can significantly reduce their intensity. Introducing sleep support is a great way to significantly impact your sleep quality.
What the evidence says
Studies have consistently shown that even short-term sleep restriction increases hunger, appetite and the preference for energy-dense foods.
5. Your Gut Microbiome May Be Playing a Role
What's happening?
Your gut is home to trillions of bacteria that rely on the foods you eat.
A diet high in fibre helps beneficial bacteria thrive, while a diet dominated by highly processed foods may reduce microbial diversity.
Although research is still evolving, emerging evidence suggests the gut microbiome may influence appetite, food preferences and communication between the gut and the brain through what's known as the gut-brain axis. (5)
While gut bacteria don't "cause" sugar cravings, supporting a healthier microbiome may make it easier to maintain stable eating habits.
What to do
Feed your gut bacteria by eating a wide variety of:
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Vegetables
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Fruit
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Beans and lentils
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Wholegrains
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Nuts and seeds
Fermented foods such as yoghurt, kefir, kimchi and sauerkraut can also contribute to a diverse gut microbiome as well as including high quality, multiple strain gut support probiotic such as Enhanced Synbiotic or Biome Restore.
The Takeaways
Sugar cravings aren't simply about having a "sweet tooth."
They're influenced by a complex interaction between blood sugar regulation, hormones, stress, sleep, gut health and psychology.
By fuelling your body consistently, managing stress, improving sleep and building a healthier relationship with food, you'll often find your cravings become less intense and much easier to manage.
Instead of fighting your body, work with it.
That's how you step off the blood sugar rollercoaster and enjoy more consistent energy throughout the day.
Disclaimer: The information presented in this article is for educational purposes only and is not intended to diagnose, prevent, or treat any medical or psychological conditions. The information is not intended as medical advice, nor should it replace the advice from a doctor or qualified healthcare professional. Please do not stop, adjust, or modify your dose of any prescribed medications without the direct supervision of your healthcare practitioner.
References
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Adam, T. C., & Epel, E. S. (2007). Stress, eating and the reward system. Physiology & Behavior, 91(4), 449–458. https://doi.org/10.1016/j.physbeh.2007.04.011
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Carabotti, M., Scirocco, A., Maselli, M. A., & Severi, C. (2015). The gut-brain axis: Interactions between enteric microbiota, central and enteric nervous systems. Annals of Gastroenterology, 28(2), 203–209.
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Epel, E. S., McEwen, B., Seeman, T., et al. (2000). Stress and body shape: Stress-induced cortisol secretion is consistently greater among women with central fat. Psychosomatic Medicine, 62(5), 623–632.
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Leidy, H. J., Clifton, P. M., Astrup, A., et al. (2015). The role of protein in weight loss and maintenance. American Journal of Clinical Nutrition, 101(Suppl), 1320S–1329S.
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Makki, K., Deehan, E. C., Walter, J., & Bäckhed, F. (2018). The impact of dietary fibre on gut microbiota in host health and disease. Cell Host & Microbe, 23(6), 705–715. https://doi.org/10.1016/j.chom.2018.05.012
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Polivy, J., & Herman, C. P. (1985). Dieting and binging: A causal analysis. American Psychologist, 40(2), 193–201.
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Reynolds, A., Mann, J., Cummings, J., et al. (2019). Carbohydrate quality and human health: A series of systematic reviews and meta-analyses. The Lancet, 393(10170), 434–445. https://doi.org/10.1016/S0140-6736(18)31809-9
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Spiegel, K., Tasali, E., Penev, P., & Van Cauter, E. (2004). Brief sleep duration is associated with decreased leptin, elevated ghrelin, and increased hunger. PLOS Medicine, 1(3), e62. https://doi.org/10.1371/journal.pmed.0010062
