How can you naturally stimulate GLP-1 through diet?
Tryptophan-rich protein sources and partially broken-down milk proteins (whey or casein) have been shown in small studies to raise GLP-1; that is the most concrete dietary strategy you can apply right now.
Tryptophan, an amino acid found naturally in dairy, chicken and nuts, among other foods, raises GLP-1 when it reaches the small intestine. In a small exploratory study with 12 healthy men, calorie intake fell from 1,085 kcal (without tryptophan) to 881 kcal after taking tryptophan alone. Interestingly, once leucine was added, this effect largely disappeared. The balance between amino acids therefore seems to play a role.
Milk protein hydrolysates, where proteins are already partially broken down so that active peptide fragments are released, raised GLP-1 by roughly 7 to 8 picomol per litre shortly before lunch, compared with a dummy product. This was seen in healthy men who received both a whey and a casein version. The higher GLP-1 levels did not, however, lead to less eating on the test day.
A nutritional supplement specifically designed to raise GLP-1 (a gut hormone that regulates feelings of fullness) did exactly that: 40 minutes after taking it, GLP-1 levels were clearly higher than in people who had taken a dummy pill. As a secondary effect, participants paid less unconscious attention to alcohol, although they did not consciously feel less like drinking.
Eating 30 grams of oat bran daily clearly raised both GLP-1 and another fullness hormone after 12 weeks. Important to note: this was studied only in people who had undergone stomach reduction or bypass surgery, not in healthy people. The effect is likely because gut bacteria digest the fibres.
Not everything you might expect to work actually does. Xylitol did not raise GLP-1, one hour of moderate exercise before a meal had no effect on GLP-1 afterwards, and eight weeks of drinking yerba maté daily did not change GLP-1 either. Xylitol did raise another fullness hormone (CCK) and lowered blood sugar and insulin compared with regular sugar.
This answer draws on several small studies in people, most of which used a crossover design in which participants served as their own comparison group. The numbers ranged from 12 to 40 participants per study. That makes the findings interesting but not yet definitive: with larger groups an effect can disappear or become more pronounced. The researchers behind the tryptophan study described it themselves as exploratory in nature. The oat bran research was carried out in a specific group of patients who had undergone bariatric surgery, and those results cannot simply be applied to healthy people.
Which foods or habits effectively raise NAD+ levels?
Exercise and NAD+ supplements (NR or NMN) demonstrably raise NAD+ levels, but whether higher levels also confer health benefits in humans has not yet been proven. Regular physical activity is the only approach for which broader health benefits have also been demonstrated.
How do you change the order of food intake for better blood sugar?
Research shows that the order in which you eat measurably affects the blood sugar spike after a meal. Eating carbohydrates last, after vegetables and protein, clearly dampens that spike, and the effect is greatest in people with type 2 diabetes.
Which peptides occur naturally in food?
Almost all protein-rich foods, from legumes to fish and dairy, naturally contain peptides that are released during digestion and can be biologically active. Studies show promising effects, but how much of that actually occurs in people has been only limitedly researched.
How many fruits and vegetables do I actually need per day?
Five portions of fruit and vegetables per day (two pieces of fruit, three serving-spoon scoops of vegetables) is the number with the strongest evidence base; eating more does not provide additional benefit, but most people do not even reach this minimum.
What health benefits do GLP-1 medications offer beyond weight loss?
In type 2 diabetes, GLP-1 medications offer well-supported protection for the heart, blood vessels, and kidneys; there are also early signs of effects on the liver and brain, but these are too preliminary to act on.
Do GLP-1 medications help with Parkinson's disease?
GLP-1 agents are showing preliminary positive signals on motor decline in Parkinson's disease, but the studies are still too small and too short-term for a clear conclusion. If you have Parkinson's disease or diabetes and want to know whether this is relevant for you, discuss it with your neurologist.