The Foods That Are Hard to Stop

There is a food in your kitchen you can eat one square of and walk away from. And there is another you cannot. We usually blame willpower for the difference. It is more useful to notice that liking a food and wanting a food are not the same system, and the second one is the one that keeps your hand moving.

Most conversations about "trigger foods" collapse three different things into one. A recent episode with Professor Graham Finlayson pulls them apart: how much you like a food, how much you want it, and how easy you perceive it to be to overeat [1]. These sound like synonyms. They are not, and the distinction is the whole point.

Liking is the pleasure you get in the moment of tasting. Wanting is the pull toward the food, the motivational tug that can operate even when the eating itself is not especially pleasurable. You have felt the gap: the fourth handful of a snack that is no longer delivering much enjoyment but that you keep reaching for anyway. That is wanting outrunning liking. The reason this matters is that diet advice almost always targets liking ("just eat foods you enjoy less") when the behaviour that drives overconsumption lives closer to wanting [1].

What shapes that pull? According to the episode, it is not one thing but several acting together: the nutritional composition of the food, its sensory characteristics, the beliefs you have learned about it, and the context in which you are eating [1]. That last two deserve emphasis, because they are the parts you can actually change. Learned beliefs mean the story you carry about a food (that it is "bad," that once you start you cannot stop) is not a neutral observation. It can become part of the machinery that produces the behaviour it describes. And context (where you are, who you are with, how tired and how hungry) can move the same food from easy-to-leave to hard-to-stop.

The most quietly radical claim in the episode is about the limits of food categories [1]. We like to sort foods into clean bins (processed and whole, good and bad, safe and dangerous), and then reason about eating behaviour from the label. Finlayson's argument is that broad categories are a poor tool for explaining something as individual and context-dependent as hedonic overeating [1]. A category tells you what a food is. It does not reliably tell you how a particular person will behave around it in a particular moment.

This connects to a second recent thread. In a separate episode, Dr Alysha Thompson examined plant-based diets stratified by whether their component foods were classified as ultra-processed, and found that processing classification did not cleanly determine the relationship between the diet and long-term health outcomes [4]. Different question, same underlying lesson: the category we reach for to simplify our thinking ("ultra-processed," "trigger food") may be doing less explanatory work than we assume. The food's effect, on your health or on your behaviour, is not fully contained in its label.

So what is the practical upshot? First, if a food is easy for you to overeat, that is data about the interaction between you, that food, and your context, not a moral fact about the food, and not a verdict on your discipline. Second, the most tractable levers are often the contextual and cognitive ones: the plate you serve it on, whether you eat it standing over the counter or sitting down, and the belief you have rehearsed about your own control. None of this is a promise that reframing dissolves a strong pull. Wanting is a real biological signal, not a bad attitude. But it does mean the honest starting question is not "why am I so weak around this" but "what about this food, and this moment, is turning liking into wanting."

The wellness industry, as Dr Nick Tiller has argued, is fluent in dressing simple stories in scientific language [3]. "Trigger foods" is one of those tidy stories. The more careful version (liking, wanting, perception, context, all interacting) is harder to fit on a label. It is also closer to true.

Research Radar

• Liking is not wanting. A recent episode distinguishes how much you enjoy a food from how strongly you are pulled toward it, and argues that overconsumption tracks the second more than the first [1]. The practical implication: reducing enjoyment is a poor lever if the problem is wanting.
• Categories explain less than we think. Analysis of plant-based diets found that classifying component foods as ultra-processed did not cleanly determine their relationship to long-term health outcomes [4]. The healthfulness of the pattern was not simply readable from the processing label.
• Fish guidelines rest on softer ground than the number suggests. A recent episode examined where the one-to-two-servings-per-week recommendation came from and what substitution analyses reveal, including whether adding fish improves an already high-quality diet [2]. The confident number hides genuine uncertainty.

One Thing To Try

Pick one food you tend to overeat. Today, notice one thing about the context rather than the food: are you standing or sitting, distracted or present, genuinely hungry or just near it? Change one of those variables and observe what happens to the pull. You are gathering data, not passing a test.

Worth Your Attention

• Hedonic Overeating with Prof. Graham Finlayson (Sigma Nutrition Radio) [1]: The clearest available breakdown of liking, wanting, and why "trigger food" is a blunt concept.
• Why Processing Doesn't Determine Healthfulness, with Dr Alysha Thompson (Sigma Nutrition Radio) [4]: A careful look at what the ultra-processed label does and doesn't tell you.
• How Wellness Culture Commodifies Science, with Dr Nick Tiller (Sigma Nutrition Radio) [3]: On the difference between citing science and representing it honestly.
• How Much Fish Should a Diet Contain? (Sigma Nutrition Radio) [2]: Where a familiar guideline actually comes from, and where the evidence thins.

The food you cannot stop eating is not a character flaw with a taste. It is liking, wanting, belief, and context meeting in a particular kitchen at a particular hour [1]. Naming the parts does not make the pull vanish. But it changes what you do about it from arguing with yourself to adjusting the room.