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
I Only Eat Meat and Dairy. It Has Changed My Life
I spent over two decades yoyo dieting. From weight loss shakes to paleo and calorie-cutting plans, any diet you can name—I probably tried it.
For around seven years I tried a low-carb keto diet on and off, which was probably the better choice of its predecessors. It worked at first, I lost weight and felt good, but I was still obsessively thinking about food.
As part of my keto diet, I was eating low-carb treats, like specially-made doughnuts, and I would have a hard time moderating them. I either didn't eat them at all, and was constantly thinking about eating them, or I would binge and restrict myself the next day.
These sweet foods continually had a hold on me.
Eventually, I discovered the concept of intuitive eating, which just means eating what feels right for your body regardless of calories or nutritional value.
But I have since learned that I am a carbohydrate and sugar addict, and within four months, I gained 40 pounds. For me, there is no moderating those food groups—it's all or nothing. There was no having one croissant. I would want them all.
I was at rock bottom and feeling awful. I was tired, overweight, depressed, and anxious. I had stomach issues, brain fog, and my acne was horrible. When I finally reached my highest weight, of 192 lbs, that was a wake-up call. I knew this had gotten out of hand.
At the time, my husband was sending me TikTok videos from a creator called Paul Saladino, who ate a diet based mainly on meat and animal-based products. No vegetables were allowed, but he still ate fruits. My husband suggested it and I decided to try it out and see if it made me feel better.
I eased myself into the diet, but was still eating lots of fruits—which my sugar-addicted brain loved. I felt a lot better, but noticed that even though I was full and satisfied with the meat, I still wanted to eat blueberries. That sugar and sweetness still had a hold on me.
So, after five weeks I switched to a strict, full-carnivore diet and after a few days, the sugar craving subsided. After reaching 30 days, I started to feel great, but once I hit 90 days, that is when the magic happened and I really started to feel the health benefits.
I had no more gas or bloating throughout the day and my acne totally cleared up. My depression lifted and I was able to stop taking the medication I had been on for years. I have also lost 45 pounds so far.
Now, I stay away from carbs, sugar, seed oils, and processed snacks. Instead, I eat only meat and animal byproducts like dairy and eggs. Typically, I eat a lot of burger patties, steaks or roasted meat. I believe beef is best, but I do eat chicken wings, tuna, and salmon.
I will eat the rainbow of animals, but I am currently doing a 30-day reset in which I only consume beef, salt, and water, because I noticed my dairy consumption was getting a little out of hand.
I haven't experienced any issues with a lack of fiber. I have never needed any supplements, as the high fat content in my diet aids digestion.
May marked one year of starting this diet and I feel amazing. I'm just grateful. I'm always in a good mood these days. Of course, I still have my moments—I have two little kids at home with me—but overall I feel really happy.
Now, I could have a plate of donuts next to me and have zero desire to eat them, part of which I feel is because I never want to slip back into my old habits again.
I believe that this diet goes against everything we've been told. I disagree with the messaging that fat and meat are bad for us, and would encourage anyone to give this diet a go for a minimum of 30 days and see how they feel.
My advice would be to think of it as an elimination diet and know that you can always go back to eating how you were before, if you want to.
Since starting this diet, I have what I consider food freedom, which many people do not understand. Often, they say I need to eat everything in moderation to have a good relationship with food, but I have since realized that abstaining gives me mental freedom.
When I was trying to eat everything in moderation, the mental gymnastics I would go through every day was just exhausting. I was obsessively thinking about food and where my next sugar fix would come from.
Now, my mind is free from all those obsessive thoughts. I still love my food and get excited that I'm going to have a ribeye, but I'm not constantly thinking about it.
Courtney Luna is a former yacht chef, recipe developer, and content creator.
All views expressed in this article are the author's own.
As told to Newsweek's My Turn associate editor, Monica Greep.
Article Source:
https://www.msn.com/en-us/health/nutrition/i-only-eat-meat-and-dairy-it-has-changed-my-life/ar-AA1d0hv5
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