Reducing two sulfur-containing amino acids increased heat production and calorie burning in laboratory mice without changing their food intake or activity, offering a possible clue to how plant-centered diets may influence metabolism.
By yourNEWS Media Newsroom
Changing the types of protein consumed may influence how readily the body burns energy, according to new research examining two amino acids commonly found in higher concentrations in animal foods.
Scientists at the University of Southern Denmark found that mice fed a diet low in methionine and cysteine generated substantially more body heat and burned more calories than animals eating a standard diet. The metabolic response approached the effect normally produced by cold exposure, which forces the body to consume energy to maintain its temperature.
The findings, published in eLife, point to dietary composition as a possible regulator of thermogenesis, the biological process through which calories are converted into heat. Rather than reducing the amount of food the animals received, researchers altered the balance of particular amino acids within their diets.
Molecular biologists Philip Ruppert and Jan-Wilhelm Kornfeld focused on methionine and cysteine, two sulfur-containing amino acids used in protein production and numerous cellular processes. Both are essential to normal health, but the study examined what happened when their dietary availability was substantially reduced for a limited period.
Over seven days, mice consuming the restricted diet ate as much food and remained as active as those in the comparison group. Despite those similarities, the animals on the low-methionine and low-cysteine diet expended more energy and lost more weight.
Researchers measured an approximately 20% increase in thermogenesis, indicating that the additional calorie burning came primarily from increased heat production rather than changes in movement or food consumption.
The team traced much of that activity to beige adipose tissue, a form of fat located beneath the skin in both mice and humans. Unlike white fat, which primarily stores energy, beige fat can behave more like a biological heater by burning fuel to generate warmth.
Cold temperatures are known to activate beige and brown fat as the body attempts to defend its internal temperature. The study found that restricting methionine and cysteine stimulated beige fat to a degree similar to that produced by cold exposure.
That result suggests the body’s energy-burning machinery can receive signals from diet as well as environmental temperature. It also raises the possibility that particular nutrients may influence whether calories are more likely to be stored or expended.
Methionine and cysteine are generally found in greater concentrations in meat, eggs and dairy products than in many plant foods. Vegetables, legumes, nuts and other plant-based foods still contain amino acids, but their overall protein composition often results in lower intake of the two compounds examined in the study.
The researchers said that difference could help explain why vegetarian and vegan dietary patterns are frequently associated with lower body weight and reduced obesity rates. However, the mouse findings do not establish that limiting the amino acids will produce the same thermogenic response or weight loss in people.
Plant-centered diets also differ from animal-heavy diets in many other ways. They typically contain more fiber, less calorie-dense food, different types of fat and a wider range of phytochemicals, making it difficult to attribute human weight differences to methionine and cysteine alone.
The research nevertheless adds to evidence that metabolism responds to nutrient quality as well as total calorie intake. Two diets containing the same number of calories may produce different metabolic effects depending on their protein, fat, carbohydrate and micronutrient composition.
That possibility challenges the idea that body weight is determined exclusively by calories consumed and calories expended through exercise. Energy balance remains essential, but hormonal signals, food composition, digestion and thermogenesis can influence how the body handles the energy it receives.
Modern Western diets often include large quantities of animal protein and highly processed food. The study raises the possibility that persistent exposure to abundant amounts of certain amino acids may reduce metabolic flexibility or suppress pathways that ordinarily promote energy expenditure.
The researchers are now interested in whether specially designed foods lower in methionine and cysteine could eventually support weight-management efforts. Such products would require careful development because both amino acids perform necessary biological functions and should not be eliminated without considering overall nutritional adequacy.
Methionine contributes to protein synthesis, methylation reactions and production of other compounds, while cysteine supports protein structure and the formation of glutathione, a major antioxidant. Severe or poorly planned restriction could therefore create nutritional problems rather than improve health.
Any future human intervention would need to determine the degree of restriction required, how long it could be maintained safely and whether the metabolic benefits seen in mice translate to people. Researchers would also need to examine possible effects on muscle mass, immune function, liver health and antioxidant defenses.
BrightU.AI’s Enoch emphasized that weight regulation depends on both food quality and quantity.
“A diet’s fat burning effect works by balancing food intake for both quality and quantity to provide proper nutrition,” Enoch said. “Restricting overeating to prevent excess calorie consumption. Encouraging a proper metabolism, which is the process the body uses to burn energy and fat.”
For now, the findings support a broader nutritional principle rather than a specific weight-loss prescription. Replacing some animal-based foods with vegetables, beans, lentils, nuts, seeds and other minimally processed plant foods may change the nutrient signals reaching metabolic tissue while also increasing fiber and lowering overall calorie density.
The research does not show that a plant-based diet can duplicate an ice bath in humans, nor does it suggest that people should attempt to eliminate methionine or cysteine. It does indicate that food composition can influence fat-burning pathways in ways that extend beyond simple calorie counting.
By demonstrating that beige fat responds to a dietary signal almost as strongly as it does to cold, the study opens another line of investigation into how nutrition might be used to support metabolic health. The eventual goal would be a sustainable eating pattern that safely encourages energy expenditure without requiring extreme temperatures, excessive exercise or medication.
Source: Natual News
Watch and learn about plant-based diet from the book “Forks Over Knives: The Plant-Based Way to Health.”
This video is from the BrightLearn channel on Brighteon.com.
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