Scientists Reveal Why Bread Can Cause Weight Gain Without Overeating17 April 2026 ByDavid Nield (Photographer Basak Gurbuz Derman/Moment/Getty Images) New research in mice shows how eating bread can cause body weight and fat mass to increase, even though caloric intake stays at a similar level. The research, led by a team from Osaka Metropolitan University in Japan, highlights how carbohydrates can contribute to weight gain as well as excessive fat intake – which is what dietary advice tends to focus on. This isn't the first time nutritionists have talked about bread and carbohydrates and their contribution to weight gain, but there hasn't been much detailed research into the relationship – especially wheat flour – or into what might be happening at a metabolic level. The team discovered that eating more wheat bread was associated with reduced energy expenditure, pushing the metabolism towards a state where fat storage is prioritized, even when the calories in a diet stay at a similar level. The researchers analyzed the difference that bread in the diets of mice had on their weight (A) and fat tissue (B, C). (Matsumura et al., Mol. Nutr. Food Res., 2026) "These findings suggest that weight gain may not be due to wheat-specific effects, but rather to a strong preference for carbohydrates and the associated metabolic changes," says nutritionist Shigenobu Matsumura of Osaka Metropolitan University. The researchers set up experiments in which lab mice were given a choice between their normal, healthy cereal-based diet and either simple bread, baked wheat flour, or baked rice flour. The mice were then monitored to check their weight and how their bodies burned calories at rest and when active. Using blood samples, the study team also examined hormone, blood sugar, and metabolite levels in the animals, while post-experiment tissue analyses assessed gene expression in the liver. The experiments showed that the mice strongly preferred to switch from their standard diet to carbohydrate-heavy snacks, which then led to weight gain and more fat tissue in the mice, particularly in the males. Further analysis and follow-up tests suggested that these two key changes were being driven not by overeating or a lack of exercise, but by the foods themselves. In the wheat flour diet, fewer calories were being burned overall, while genes responsible for turning carbohydrates into fat were activated. Another follow-up test focusing on the wheat flour group showed that when the chow diet was restored, the weight gain stopped, and the metabolic shifts were reversed. "In the future, we hope this will serve as a scientific foundation for achieving a balance between 'taste' and 'health' in the fields of nutritional guidance, food education, and food development," says Matsumura. The findings are more evidence of how what we eat can cause changes in how our body processes food and burns the calories it contains. In the case of bread, it seems to slow down the body's metabolic engine. One limitation of the study is that it used mouse models, rather than human volunteers. While it's likely that similar processes are happening in people, it's not certain – so that's something future studies can pick up. The researchers also want to experiment with a broader selection of foods to identify what exactly it is about bread that causes this reaction. No diet study like this exists in isolation, of course. We know that a variety of other factors can also impact how our metabolism reacts to food and drink, including age and hormone-related changes. Related: There's a Surprising Link Between a Key Nutrient, Obesity, And Alzheimer's Risk Further research should help establish the role that wheat and bread can play in a diet and how the simple "calories in, calories out" rule isn't always straightforward. "Going forward, we plan to shift our research focus to humans to verify the extent to which the metabolic changes identified in this study apply to actual dietary habits," says Matsumura. "We also intend to investigate how factors such as whole grains, unrefined grains, and foods rich in dietary fiber, as well as their combinations with proteins and fats, food processing methods, and timing of consumption, affect metabolic responses to carbohydrate intake." The research has been published in Molecular Nutrition & Food Research. ARTICLE SOURCE: https://www.sciencealert.com/scientists-reveal-why-bread-can-cause-weight-gain-without-overeating
....and things are great! Not craving any carbs, my overall appetite is down, i am down 5 pounds from 178, and i've noticed that my chronic pain is lessened. So much so that i think i can finally stop taking Ibuprofin [and more recently Tylenol]. I've been taking a lot of ibuprofin for literally decades to address pain and infalmmation. And while i still have serious Lumbar spine issues, and other joint pains too, i think i can finally be done with the whole otc mess. I still vape, but at least i am using an organic product and my goal is to get off of it. I also completely eliminated seed oils from my diet, which are highly inflammatory.
i used to do keto for a good two years and lost like 50 pounds but i got off track and got to eating a carb heavy poisonous SAD again. My last visit to my doctor showed my cholesterol level high and he wanted me to go on prescription drugs to fix it. I am 63 years old and the only pharmicutical drug i take is Trazodone for sleep. The last thing i want is to be drugged up and addicted to pharmicutical drugs in a system that is designed to make you sick and keep you sick and returning for more drugs. So last week i decided that the best way to fix my body's problems is through diet and begin walking again.
My inlaws, nice people but they are now deceased. The dad had diabetes and he died from dementia. The mom she was obese and she died from dementia. The common denominator is them listening to their doctors and doctors on TV thinking they were the experts. They didn't eat red meat but they ate pork. They didn't eat butter, but they ate margarine. Everything else they ate was crap loaded with carbs and bad oils. They were on a lot of prescription meds brcause that's how you fix your body's problems, and that's the sick end game with the entire SAD/Pharmaceutical drugs cycle. I know that i am having some brain fog issues and its probably diet related. I am hoping i can reverse the inflammmation in my body that is causing all my issues, and resolve them with the Carnivore diet. Honestly, i don't give a rip what others say about my dietary choices and i am not even going to tell my doctor because he will likely try "correcting" my thinking. Anyways, i am a happy carnivore now!
Edited by Carnivore Chef
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