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
Ex-vegetarian hits rock bottom and tries the carnivore diet for a month
‘I’m never going back to a meatless existence.’
Amira Stevenson-Hynes tries the controversial carnivore diet, eating only meat, eggs, raw animal-based dairy products, fruit and honey for a month.
Do you remember last year when The Hills star Heidi Montag made headlines for her Instagram video of her chomping down on a raw cow’s liver in an effort to fall pregnant? (Let me remind you.)
Well I followed the Montag-approved carnivore diet for a month and you might not believe it, but I think she’s onto something.
There’s nothing like hitting rock bottom to open you up to trying new things. So when I found myself chronically bloated, iron deficient, suffering from endometriosis and depression, this ex-vegetarian was ready, willing and able to let meat back into my life in the hope it would cure all that ailed me.
What is the carnivore diet?
Doctor Paul Saladino, who calls himself carnivore MD, is one of the leading medical authorities of the carnivore diet. The carnivore diet he endorses consists of eating meat (nose to tail), eggs, raw animal-based dairy products, fruit and honey.
Fed up with Western medicine, Saladino created the diet based on the diet of one of the last remaining hunter-gatherer tribes, the Hadza people of Tanzania. This tribe experiences almost no auto-immune disorders, obesity or diabetes; all of which are associated with the gut.
Saladino claims this diet can be a cure-all for issues of the body, from fertility to depression, arthritis to erectile dysfunction. An important part of Saladino’s diet is consuming meat from 100% grass fed and finished sources to ensure the nutritional benefits you’re receiving are top-notch.
Why aren’t vegetables included in the carnivore diet? Well, Saladino believes they aren’t actually good for you.
He points to two studies to prove his point - the first which found raw and cooked vegetables ineffective against preventing cardiovascular disease and another that found both fruits and vegetables had no effect on oxidative DNA damage (one of the stimuli responsible for cancer development) and repair in healthy nonsmokers.
There’s no doubt this diet is controversial. It completely rejects mainstream medicine's ideas that vegetables are the leafy-green path to optimal health, grain-based fibre is a key to regularity and consuming large quantities of meat is a sure fire way to develop heart disease.
However, a 2021 Harvard University study concluded, “Contrary to common expectations, adults consuming a carnivore diet experienced few adverse effects and instead reported health benefits and high satisfaction.”
In the online self-reported study of 2029 participants over 6 months the average participant lost 20lbs, 100% of diabetic participants came off injectable medication and there was a 90% improvement in all patient’s diseases. Other notable findings include 85% of participants reporting better mental clarity, 69% reporting better sleep and 89% reporting higher energy levels.
Fair warning to any vegetarians out there who want to tango with meat again, be close to a toilet. Lucky for me, the meat shits (the diarrhea you experience after breaking vegetarianism) only lasted a single day but I’ve never been so close to soiling myself at work.
From the moment the first bit of steak hit my lips I knew there was no turning back. After years of lethargy and generally poor health the almost instant energy that meat gave me was exactly what my body was craving.
On the carnivore diet I experienced no bloating, regular bowel movements (excluding the day one diarrhea), increased levels of energy, a dramatic decrease in endometriosis symptoms and a slight decrease in depressive symptoms. My most recent blood test also shows my iron levels are back in the healthy range.
However, these improvements didn’t come without sacrifice. The novelty of eating only meat, fruit, honey and raw animal-based products very quickly wears off. While cravings for my previous lovers that go by the names of sourdough bread, chocolate, pasta and teriyaki chicken sushi rolls lessened over time they did not go away.
In addition to craving foods that would tickle my palette more than plain steak and apples ever could, there was the added sacrifice of not being able to eat in social settings. There is nothing quite as torturous as watching your friends dig into a delicious meal while you sit on the sidelines thinking about the plain hamburger patty you have waiting for you at home.
It probably won’t come as a surprise that I also got some pretty weird reactions from people when I told them what I was doing. But their confusion turned to disbelief when it came to the organ meats of it all.
In the aforementioned organ eating instagram video Heidi Montag claims, “There are so many health benefits to eating liver and [other] animal organs,” and Dr. Saladino agrees. He touts organ meat's jam-packed nutritional benefits on his website for desiccated organ meat supplements and on social media.
Since I wasn’t going to be getting any nutritional benefits from vegetables (or vegetables didn’t have them to begin with, depending on whether you believe the above studies) I decided I needed to give organ meats a go. I started with fried liver which can only be described as gross. I then moved on to cutting up little bits of liver and swallowing them like tablets to consume them without having to taste them, which worked well.
But ultimately I settled on Dr. Saladino’s desiccated organ supplements as the least offensive and most effective way to consume animal organs daily. In addition to the carnivore diet, organ supplements have further increased my energy levels and made me even more regular for those of you (sickos) at home with vested interest in my bowel movements.
When it comes to the billion dollar health and wellness industry it’s important to proceed with caution. Be skeptical about fix-all cures, doctors that claim to have it all figured out and diets as extreme as this one. I encourage anyone who is considering the carnivore diet to do their own research.
For this ex-vegetarian, the carnivore diet has changed my life. Reintroducing meat has done wonders for my overall health. I’m sleeping, pooping, exercising, working and generally living better.
The biggest sacrifice of this diet was missing out on social eating experiences. But after a month of eating strictly carnivore I incorporated a few social meals a week back into my diet, eating whatever I wanted for those meals. Thanks to my otherwise strictly carnivore diet and organ supplements, these meals have had little effect on my overall health.
That being said, most weekday lunches and dinners you’ll still find me chowing down (tyrannosaurus rex-style) on a steak, some roast chicken or hamburger patties.
Amira is a Sydney-born, New York-based freelance writer with a Bachelor of Communication (Media Arts and Production) from the University of Technology Sydney. Amira has five years of experience working in the TV/film industry and as a freelance writer in Australia and abroad. You can find her here.
Source: https://www.bodyandsoul.com.au/nutrition/exvegetarian-hits-rock-bottom-and-tries-the-carnivore-diet-for-a-month/news-story/59b6747ecaa0c69da08c49bb0141ff3b
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