Carbohydrates like bread and rice may drive weight gain in unexpected ways.
Bread has been a dietary staple for centuries, shaping cultures and daily meals around the world. But as obesity rates continue to rise, researchers are taking a closer look at whether heavy reliance on foods like bread still fits with modern health needs.
Obesity, Diet, and the Overlooked Role of Carbohydrates
Obesity is linked to a wide range of lifestyle-related diseases, making prevention increasingly important. Much of the research on weight gain has focused on high-fat intake as the main cause, which is why many animal studies use high-fat diets.
At the same time, carbohydrates such as bread, rice, and noodles remain everyday staples for many people. Despite this, their role in weight gain and metabolism has not been studied as extensively. Common beliefs such as “bread makes you gain weight” or “carbohydrates should be limited” persist, but it has been unclear whether these effects come from the foods themselves or from broader eating patterns and preferences.
Weight Gain Without Increased Calories
The results showed a clear preference for carbohydrates. Mice chose carb-rich foods and stopped eating their standard chow entirely. Even though their total calorie intake did not rise significantly, both body weight and fat mass increased.
Mice that consumed rice flour gained weight in the same way as those given wheat flour. Interestingly, mice in the High-fat diet (HFD) + Wheat flour group gained less weight than those in the High-fat diet (HFD) + Chow group.
