If adults eat 35 grams of walnuts every day while living their normal lives, they end up eating about 133 extra calories per day — but they don’t gain as much weight as you’d expect because they naturally eat a bit less of other foods.

What we've found so far is that eating 35 grams of walnuts daily increases calorie intake but does not appear to lead to the amount of weight gain you might expect. Our analysis of the available research suggests this may be due to natural adjustments in overall eating habits. We analyzed the evidence and found 51.0 supporting assertions and 0 refuting assertions related to this question [1]. The evidence we’ve reviewed shows that when adults eat 35 grams of walnuts every day as part of their usual lifestyle, they consume about 133 extra calories per day [1]. Despite this increase in calorie intake, they do not gain as much weight as simple calorie math would predict [1]. The reason appears to be that people tend to eat slightly less of other foods, even without intentionally trying to restrict calories [1]. This offset helps reduce the overall calorie surplus. The evidence we’ve reviewed leans toward the idea that adding walnuts to the daily diet does not result in proportional weight gain, likely because of compensatory eating behaviors. However, we are still building our understanding, and this conclusion is based on the limited set of assertions we’ve analyzed so far. It’s important to note that we are not saying walnuts prevent weight gain or are calorie-free. We’re only reporting what the current evidence shows: that the body’s response to added walnut consumption involves subtle changes in eating patterns that affect net calorie intake. Practical takeaway: If you add a handful of walnuts to your daily routine, you’re adding calories — but your body might naturally adjust by reducing how much you eat elsewhere, which could help balance things out.