A high-protein diet is one of the most well-supported nutritional strategies for improving body composition, preserving muscle, and supporting long-term health. Research consistently shows that most people benefit from eating more protein than conventional guidelines have historically recommended, and the science behind why is clearer than ever.

Key Takeaways

• A high-protein diet has many benefits, helping with muscle strength, fat loss, skin health, and immunity, among other advantages.

• Protein deficiency can contribute to health issues like muscle loss, a weakened immune system, and osteoporosis.

• There is increasing evidence that consuming at least 1.2 to 1.6 grams of protein per kilogram of bodyweight per day is beneficial for most people.

• While it can help you retain and gain muscle, there's no risk of unintentionally bulking up like a bodybuilder.

Why Protein is Crucial for the Body

It's the afternoon of a long day of work, and hunger is starting to creep in. The leftover pastries from lunch are suddenly very tempting. But swapping that sugary option for a high-protein snack can reduce hunger and help you eat less overall.

If you want to gain muscle, manage weight, and stay at peak physical performance, a high-protein diet is the way to go. Here's what to know about why protein is so important, the benefits of getting enough, how to balance intake, and myths to watch out for.

Protein Basics

Proteins are made up of long chains of amino acids that play several important roles, acting as the building blocks for structures throughout the body. This includes helping grow muscle, skin, blood vessels, and other tissues. They also protect us from viruses and bacteria. Of the 20 different amino acids the body needs, 11 are nonessential, meaning our bodies can produce them on their own. The other 9 amino acids are considered essential. Our bodies are not capable of synthesizing them, and they must come from food.

If you don't get enough protein, you can experience a variety of health issues, like muscle loss, a weak immune system, dry skin, hair loss, and osteoporosis.

A high-protein diet, on the other hand, has numerous benefits — and not just for people looking to gain lots of muscle.

A High-Protein Diet Can Help You Lose Fat and Keep Muscle

Protein has long been recognized as a key part of a balanced diet.

The recommended dietary allowance (RDA) for protein was recently updated in the 2025-2030 Dietary Guidelines for Americans to 1.2-1.6 g/kg of body weight per day, up from the longstanding 0.8 g/kg baseline. (Divide your weight in pounds by 2.2 to find out what you weigh in kilograms.) The previous RDA represented the bare minimum needed to prevent deficiency, not an optimal target. Research consistently shows that intakes of at least 1.6 g/kg per day produce meaningful gains in lean mass for those engaged in resistance training.

Take weight management. Multiple clinical trials suggest that eating more protein than the recommended allowance can reduce body fat while preserving muscle. That's true whether you're on a low-calorie or regular-calorie diet.

This happens for a few reasons. High-protein diets increase diet-induced thermogenesis (DIT) — essentially, the energy needed by the body to process food, on top of what it needs to keep you alive. Dietary protein has a significantly higher DIT of about 20-30%, than carbohydrates (5-10%) and fats (0-5%). So a higher-protein diet means the body burns more calories just by digesting food. A higher DIT also helps keep you feeling full, which contributes to weight loss and keeps you energized throughout the day.

At the same time, eating protein helps your body maintain muscle instead of breaking it down for energy, even when you're in a calorie deficit. This is why it's becoming standard practice to recommend protein-rich diets for people taking GLP-1 weight-loss medications like Wegovy and Zepbound.

Since GLP-1 drugs often reduce appetite, consuming concentrated protein sources like bars and shakes can be especially helpful for people trying to meet the high protein targets on these medications.

High-Protein Benefits for Skin and Immune Health

Higher-protein diets play a role in supporting firm skin and full, strong hair. This is because the body needs protein to make keratin, elastin, and collagen — key building blocks for healthy skin and hair.

Protein is also crucial for your immune system to function properly and fend off viruses and bacteria. Without it, the body can't produce enough antibodies to fight these invaders. Eating a wide variety of proteins (including both animal and plant-based proteins) can help optimize the immune system even further.

Eating more protein can be a major contributor to healthy aging in general. Research suggests that higher protein intake during older age can help preserve bone health, muscle strength, and overall immune health.

Protein Safety: What Are the Risks of Eating Too Much Protein?

For most healthy people, eating a high-protein diet is safe.

Myth #1: High Protein Diets Negatively Impact Kidney Function

One of the biggest myths is that eating too much protein hurts kidney function. But there's no ceiling where protein suddenly becomes dangerous for healthy adults, and the idea of a strict upper limit is largely unfounded.

Protein intake of up to 2.2 g/kg per day appears safe for the kidneys in healthy people, and there is no solid long-term data on protein intake beyond these levels.

While the 1.2-1.6 g/kg RDA is suitable for most individuals, the International Society of Sports Nutrition recommends a moderately higher protein intake of up to 2 g/kg for people trying to maintain or build muscle, and studies have shown potential benefits for athletes all the way to 3.0 g/kg with no adverse effects.

People who have chronic kidney disease or are at risk for it, like those with diabetes and high blood pressure, should talk to a doctor before increasing protein intake. For these people, a high-protein diet can impair kidney function.

Myth #2: High Protein Diets Make You Bulky

The myth that eating a high-protein diet will automatically make you "bulk up" is also untrue. Protein alone helps you retain the muscle you already have. But if you want to gain muscle, you need to eat a high-protein diet and do strength training on top of that. And there's no risk of becoming as muscular as a bodybuilder — their "bulking" periods involve very high calorie intakes and can often include the use of performance enhancing drugs.

How to Get Started on a High-Protein Diet

To increase protein intake, first determine a target based on body weight. For example, a 70-kilogram (154-pound) man aiming for 1.2 to 1.6 g/kg of protein per day needs to consume 84 to 112 grams of protein daily. That's 25 to 40 grams of protein per meal, plus high-protein snacks in between.

This might look like Greek yogurt (20g per cup) with berries and nuts (5-7g) at breakfast, a palm-sized portion of chicken (35g in 4 oz) with vegetables at lunch, and a tuna burger on a bun (30g in 4 oz) for dinner. In between, snacks could include cottage cheese with fruit (14g), two hard-boiled eggs with a handful of almonds (18g), or, if you are short on time and need something more portable, a high protein bar (28g).

Don't forget about fiber; eating lots of fruits, vegetables, beans, and lentils will keep your gut healthy as you ramp up protein intake. Drinking enough water, at least four to six cups of plain water each day depending on activity level, can also help with digestion.

Consistency is key. You can start to feel the positive effects of protein, like less hunger and fewer cravings in a matter of days. Over time, a high-protein diet can help increase muscle strength, support fat loss, improve skin health, and boost immunity, making it an important part of long-term health.