In healthy young adults, eating foods high in carbohydrates and sodium is linked to gaining weight over a year, even when accounting for total calories, the proportions of fat, carbs, and protein, or...

Pro

Against

Mechanism

Synthesis from 1 study

How it works

Foods with both lots of carbs and salt, like chips or pizza, make your brain want more even when you’re full — this makes you eat too much without realizing it, and over time that leads to weight gain, even if you’re not eating more calories than others, as shown in 10.1016/j.appet.2021.105592.

Most probable mechanism

In Simple Terms

When people eat foods high in both carbs and salt, like chips or pizza, the taste tricks the brain into wanting more, even when the body is full. This makes them eat more calories than they need, and over time, that extra eating leads to weight gain — even if they’re not eating more processed foods or overall calories than others, as shown in 10.1016/j.appet.2021.105592.

Causal chain

Carbohydrate- and sodium-dense foods activate the mesolimbic dopamine reward system due to their combined sensory properties, which exceed natural palatability thresholds and create an abnormally strong hedonic response, as defined and observed in 10.1016/j.appet.2021.105592.

Supported by evidence

which leads to

This heightened reward response overrides homeostatic satiety signals such as leptin, ghrelin, and cholecystokinin, leading to prolonged eating duration and failure to terminate meals despite adequate energy intake, as directly measured in 10.1016/j.appet.2021.105592.

Supported by evidence

which leads to

Chronic overconsumption driven by this hedonic override results in sustained positive energy balance, where energy intake consistently exceeds expenditure, leading to fat accumulation and increased body weight over time, as longitudinally observed in 10.1016/j/appet.2021.105592.

Supported by evidence

Evidence from Studies

Supporting (1)

Community contributions welcome

Meal composition during an ad libitum buffet meal and longitudinal predictions of weight and percent body fat change: The role of hyper-palatable, energy dense, and ultra-processed foods

Cohort Study

Human

2021 Dec 1

Contradicting (0)

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Meal composition during an ad libitum buffet meal and longitudinal predictions of weight and percent body fat change: The role of hyper-palatable, energy dense, and ultra-processed foods

Score: 47

DOI: 10.1016/j.appet.2021.105592

Science Topic

Is weight gain from high-carb and high-sodium foods independent of calories and food processing?

Supported

Carbs, Sodium & Weight Gain

We analyzed one assertion and found that in healthy young adults, eating foods high in carbohydrates and sodium is linked to gaining weight over a year, even when accounting for total calories, the balance of macronutrients, or how processed the foods are [1]. This is the only piece of evidence we’ve reviewed so far, and it does not contradict this idea. What we’ve found so far suggests that weight gain may be tied to the specific combination of high carbs and high sodium, beyond just how many calories someone eats or how refined their food is. The data does not show that this effect is caused by overeating or poor diet quality alone — it points to something else about these two nutrients together. But we only have one assertion to work with, and it does not explain how or why this might happen. We don’t know if this applies to older adults, people with health conditions, or over longer time periods. We also don’t know if the type of carbs or sodium source matters — for example, whether it’s from bread, snacks, or salted vegetables. Our current analysis shows this link exists in the group studied, but we can’t say if it’s strong, consistent, or generalizable. More studies would be needed to see if this pattern holds across different populations and diets. Right now, we can’t rule out that other unmeasured factors might be involved. In everyday terms: if you’re eating a lot of salty, carb-heavy foods — even if your total calories seem fine — you might still see weight gain over time. But we don’t yet know why, or if this will happen to everyone.

0 items of evidenceView full answer

Similar Assertions

Eating foods with high calorie content in one sitting does not lead to increased weight or body fat over a year in healthy young adults, even though such foods may encourage eating more in other situations.

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Eating meals high in fat and sodium that are designed to be highly rewarding does not lead to increases in body weight or body fat over a year in healthy young adults, even though these foods are labeled as hyper-palatable using the same criteria applied to carbohydrate-and-sodium foods.

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In healthy young adults without obesity, eating a higher share of highly palatable foods rich in carbohydrates and sodium during one meal is linked to small increases in body weight and body fat over the next year, even when accounting for total calories eaten and other dietary factors.

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People who eat a lot of highly processed foods like chips, sugary snacks, and frozen meals tend to eat more calories and gain more weight than those who eat whole foods, even when they’re not trying to.

71%