What makes a food “highly rewarding” to the brain, and why does this drive overconsumption?
The Short Answer
Highly rewarding foods activate the brain’s reward circuitry in patterns resembling those seen with addictive drugs (imaging that measures a blood-oxygen signal rather than dopamine, a limit the study itself names). What makes food highly rewarding: combinations of sugar + fat, fat + salt, or carbs + salt in concentrations rarely found in nature; high calorie density; highly palatable texture and flavor; and novelty. These combinations are described by the defining paper’s authors as possibly facilitating overconsumption despite satiety. The brain says “more, more, more” because it evolved in scarcity and now meets constant abundance. Understanding food reward explains why you can’t stop eating chips but can stop eating broccoli.
Something to Sit With
Which foods in your life trigger the “can’t stop” experience?
Does knowing that response is predictable change how you feel about struggling with them?
What would happen if you reduced your exposure to highly rewarding foods?
Learn More
The Reward System Basics.
Your brain has a reward system designed to motivate survival behaviors. When you do something beneficial (eat, drink, connect socially), dopamine is released, driving the motivation to do it again: the wanting, which is not the same thing as the pleasure.
For most of evolution, this worked well:
- Food was scarce
- Calorie-dense foods were rare
- The reward signal matched the survival value
- Overeating was physically difficult (whole foods are self-limiting)
Modern food changed every one of those conditions.
What Makes Food Highly Rewarding.
Hyperpalatable combinations. Fazzino and colleagues defined these quantitatively:
- Fat + sugar (>20% fat calories + >20% sugar calories)
- Fat + salt (>25% fat calories + ≥0.30% sodium by weight)
- Carbs + salt (>40% carb calories + ≥0.20% sodium by weight)
These combinations are the ones Fazzino and colleagues define quantitatively: fat with sodium, fat with sugar, carbohydrate with sodium, above set thresholds, which captured no fresh or raw fruits, meats, or fish.[1] The imaging behind it set processed food against a tasteless control rather than against whole food, so it yields no comparison of size between them.
Calorie density. More calories per bite may mean a stronger signal. A tablespoon of oil has more calories than a cup of vegetables. The brain responds to calorie density.
Texture. Foods that are crispy, creamy, crunchy, or melt in your mouth.
Flavor intensity. Concentrated and enhanced flavors, at concentrations whole foods do not carry.
Novelty and variety. New flavors can reset the reward response, likely part of why buffets encourage overeating.
Why Reward Drives Overconsumption.
Wanting exceeds liking. You can stop wanting something you’re enjoying (satiety). Highly rewarding foods can create wanting that persists past liking. You keep eating even when it no longer tastes as good.
Fullness may not stop you. Normal food triggers fullness. Combinations of this kind may facilitate overconsumption despite satiety, on the preliminary account the composition research offers.
Tolerance, in animal studies. In rats, tolerance develops, and on an intermittent schedule daily sugar intake rose over the first eleven days and then held steady; whether the same happens in people is not what those studies establish.[2]
Cravings persist. Between eating occasions, memories of highly rewarding foods can create cravings. You think about them, seek them out.
The Brain Imaging Evidence.
Research by Gearhardt and colleagues, imaging 39 young women with the key contrast resting on fifteen participants against eleven, found:
- Highly palatable foods activating reward regions in patterns resembling those seen with addictive drugs
- Higher “food addiction” scores going with greater anticipatory reward activity and reduced activation of inhibitory regions while eating
- Anticipation of palatable food triggering reward responses before eating
- Those scores correlating with emotional and external eating but not with BMI
The effect sizes are large and the sample is small; both are true.[3]
Whole Foods vs. Processed Foods.
Whole foods:
- None of the fat-and-sugar or fat-and-salt combinations above those thresholds
- Satiety tends to follow
- A clearer stopping point
- Less likely to drive persistent cravings
Highly processed foods:
- Often built on those combinations, above the thresholds that define them
- Eating may continue despite fullness
- Hard to stop
- Prone to cravings
This may explain why willpower seems to work for some foods but not others. You’re not weak: you’re responding to hyper-palatable food.
Practical Implications.
Avoid or limit hyperpalatable foods. Not because you’re bad for liking them, but because they are easy to overeat. Moderation is the goal; for some people, avoidance is easier.
Expect the difference. Food without those combinations tends to feel less compelling, at least at first. Accept this; the calmer experience is the point.
Don’t blame yourself. Struggling to stop eating chips isn’t character failure. It’s a predictable response to hyper-palatable food.
Environment matters. Available hyperpalatable food tends to get eaten. Environment design is often more reliable than willpower.
Further reading:
- Gearhardt AN et al., “Neural correlates of food addiction”[4] — Archives of General Psychiatry, 2011
- Fazzino TL, Rohde K & Sullivan DK, “Hyper-palatable foods: development of a quantitative definition and application to the US food system database”[5] — Obesity, 2019
- Kessler DA, The End of Overeating[6] (2009)
Written by AI, directed and approved by me. How this is made →