If you find yourself standing in front of the fridge shortly after dinner, you are far from alone. Research indicates that roughly one in three people snack every night after their evening meal, and among those aged 18 to 24, as many as four in five struggle to resist. These evening snack cravings are not simply a failure of discipline; they are rooted in physiology and habit, according to dietitians and appetite researchers.
Dietitian Dr Kristine Beaulieu warns that this pattern can have consequences. Evidence shows that the more people eat within two hours of going to bed, the greater their odds of weight gain and obesity. Yet the urge to nibble at night is common, and understanding why can help you manage it.
Your appetite naturally rises at night
Even though we go many hours without food while sleeping, our appetite tends to peak in the evening, largely regardless of how much we have eaten during the day. Prof James Betts, who studies how the body handles food and energy at the University of Bath, points to the hunger hormone ghrelin. Levels of ghrelin are generally higher later in the day, and while a meal can suppress it, that effect is strongest after breakfast and much weaker after lunch or dinner.
What you eat earlier also matters. Meals rich in protein, fibre and volume tend to keep us fuller for longer. Betts notes that a lack of a nutritious or satisfying evening meal can lead to a crash later on, prompting a snack. For some, the fear of waking up hungry in the night adds to the motivation, and plain habit plays a role too.
Prof Suzanne Higgs, an appetite expert at the University of Birmingham, explains that when snacking repeatedly happens in the same setting, the surrounding cues can trigger cravings. Someone who usually snacks while watching television may find that simply switching on the TV makes them feel like eating.
Why sweet and fatty foods call louder
Hunger is only part of the story. Research suggests that later in the day our appetite for calorie-dense foods becomes stronger, driven by the brain’s reward system rather than a genuine need for energy. Beaulieu, who splits her time between the University of Leeds and the University of Moncton in Canada, says that our liking and wanting for high-fat foods are greater later in the day compared with low-fat options. This hedonic drive can override fullness signals, making us want a snack or dessert even when we are already full.
Even after a substantial dinner, foods high in sugar, fat or salt can continue to activate reward pathways in the brain. So reaching for the biscuit tin at 9pm may have less to do with willpower and more to do with biology.
Does snacking interfere with sleep?
The evidence is mixed. A large meal late in the evening certainly affects digestion and the body’s normal preparation for sleep, but the for snacking is less clear. Some research links foods high in refined carbohydrates and added sugars, such as white bread, white rice, biscuits and cakes, to poorer sleep. Researchers suggest this could be because such foods cause bigger swings in blood sugar and may alter hormonal signals involved in regulating sleep and appetite.
However, untangling cause and effect is difficult. People who sleep poorly may be more likely to snack on sugary foods. Prof Jonathan Johnston, a sleep and body clock expert at the University of Surrey, notes that sleep deprivation is known to increase appetite and the desire for energy-dense foods. Prof Betts adds that it is very difficult to draw firm conclusions about whether late-evening snacking disrupts sleep, and that individual responses to different foods before bed may vary.
How to snack more healthily
Rather than banning evening snacks outright, experts suggest a more practical approach. Start by working out what is driving the snacking. If you are genuinely hungry, making earlier meals more filling can help. If the habit is largely routine, changing your routines and planning snacks in advance may be useful.
Higgs points out that eating while distracted, such as in front of the TV, can lead people to consume more because they pay less attention to how much they have eaten. Beaulieu advises that there is no need to cut out evening snacks completely; a reasonable portion of something enjoyable is often more sustainable. Keep healthy options such as fruit, yoghurt and nuts available, and remember that even a little chocolate now and then is not the end of the world.
She says it is fine to eat craved foods once in a while in moderation. The trick is to make the healthy choice the default. If those craved foods are not in the cupboard on a regular basis and a healthy option is, you are more likely to choose the healthier option.
