What happens to your body when you eat 100 grams of protein a day?

Consistently consuming 100 grams of protein daily can support muscle growth and repair, boost metabolism, and preserve muscle mass while losing fat, according to health news platform Eat This, Not That.
Trista Best, a registered dietitian based in the U.S., explains the benefits of incorporating 100 grams of protein into your daily diet. Here’s a closer look at how this amount of protein can positively impact your body:

Supports muscle growth and repair

When you consume 100 grams of protein daily, your body receives the essential amino acids—protein’s building blocks—that are necessary for muscle protein synthesis (MPS). MPS is the process your body uses to repair and build muscle tissue, particularly after exercise.

"Protein intake plays a crucial role in muscle growth, metabolism, and fat loss," says Best. "It provides the essential amino acids needed for muscle protein synthesis, helping repair and build muscle tissue, especially after physical activity."

Boosts Metabolism

According to Healthline, your body burns calories when digesting and utilizing the nutrients in food—a process known as the thermic effect of food (TEF). This effect varies depending on the type of food you eat.

Certain foods require more energy to digest, which increases the TEF and the number of calories you burn overall. Among all macronutrients—carbo hydrates, fats, and protein—protein has the highest TEF.

"Protein plays a key role in metabolism," explains Best. "The body burns more calories digesting protein than fats and carbohydrates."

This means that eating more protein can help increase overall calorie expenditure, which in turn supports fat loss. The body simply works harder to break down protein compared to other nutrients.

Preserves Muscle Mass While Losing Fat

When you're losing weight, especially through a calorie deficit, your body may break down muscle tissue for energy. However, consuming enough protein can help prevent this.

Protein provides the amino acids needed to preserve lean muscle mass. Maintaining muscle is important because it helps keep your metabolism high, even when you're consuming fewer calories.

In addition to preserving muscle, protein helps control appetite. It promotes a feeling of fullness, which can make it easier to stick to a weight loss plan and avoid unnecessary snacking.

This appetite regulation is particularly useful during a calorie deficit, as it helps reduce hunger cravings, making dieting more sustainable.

A study published by the U.S. National Library of Medicine also suggests that a high-protein diet may help prevent weight regain after losing weight. This highlights the long-term benefits of maintaining a high-protein intake.