What happens if you work out but don't eat enough protein?

Author: Prof. Zachery Gutmann PhD  |  Last update: Friday, May 30, 2025

Lower Energy Levels and Strength – Without enough protein, energy levels may dip, leading to sluggish workouts and decreased performance. Protein helps regulate blood sugar levels and supports muscle function, both essential for sustained energy.

What happens if you exercise and don't eat enough protein?

Decreased workout performance: Protein is important for energy production and muscle function (2). Without enough protein, you may experience decreased energy levels, reduced strength, and diminished workout performance. This can make it harder to lift weights effectively and achieve your fitness goals. Learn more: 1.

Can you build muscle with low protein?

In summary, while it is possible to build muscle on a low-protein diet, it is typically less efficient and may result in slower progress. For optimal results, aiming for adequate protein intake is recommended, especially for those looking to gain muscle mass.

Will I lose my muscle if I don't eat enough protein?

In the absence of enough amino acids, the body will breakdown existing muscles to get amino acids, which is known as muscle catabolism and results in loss of muscle mass. Not consuming enough protein after a workout will result in hindered muscle recovery, muscle growth and repair, and loss of muscle mass.

Is it OK to build muscle without protein?

Protein and a calorie surplus are essential if your goal is to build muscle. They work together to create building blocks for tissue growth and repair, and without them, you will not be providing your body with the tools it needs to increase muscle.

Do You REALLY Need Lots of Protein To Build Muscle?

What happens if you lift but don't eat enough?

Lifting and doing strength training without adequate nutrition, especially without enough protein, can actually lead to loss of muscle tissue. Furthermore, if you aren't eating right you won't have the energy to do the workouts that lead to muscle gain.

How do you tell if you need more protein?

Signs of a protein deficiency
  1. Brittle hair and nails, often the first sign of deficiency.
  2. Feeling weak or hungry, since protein supplies energy and satisfies the appetite.
  3. Getting sick often without protein to boost the immune system.

Can lack of protein affect sleep?

In terms of carbohydrates, whole grains are preferred over simple carbohydrates and highly processed grains, as they are healthier and may improve sleep. Studies have also found that consuming too much or too little protein can negatively impact sleep.

How much protein is too little?

The Recommended Dietary Allowance (RDA) for protein is a modest 0.8 grams of protein per kilogram of body weight, or 0.36 grams per pound. The RDA is the amount of a nutrient you need to meet your basic nutritional requirements.

How much protein do I need per day?

The recommended dietary allowance to prevent deficiency for an average sedentary adult is 0.8 grams per kilogram of body weight. For example, a person who weighs 165 pounds, or 75 kilograms, should consume 60 grams of protein per day. If you're over age 40-50.

Can muscles repair without protein?

Protein is needed for both building and repairing muscle, so you might think to gain more muscle quickly you need to eat extra protein.

Are protein pills good for you?

While these supplements affect the body positively, caution has to be exercised while consuming them in excess, as they have been shown to cause hyperfiltration and increased urinary calcium excretion which can, in turn, lead to chronic kidney disease development.

What happens if you lift weights but don't eat protein?

If you regularly hit the gym but don't consume adequate protein, your body will struggle to repair and grow muscle tissue effectively. Protein plays a crucial role in muscle growth, recovery, and overall performance.

What is the disease caused by lack of protein?

Kwashiorkor. Kwashiorkor is a type of malnutrition characterized by severe protein deficiency. It causes fluid retention and a swollen, distended abdomen. Kwashiorkor most commonly affects children, particularly in developing countries with high levels of poverty and food insecurity.

What are symptoms of low protein intake?

Low protein in your blood may be linked to any different symptoms, including:
  • Brittle hair, hair loss and loss of hair pigment.
  • Dry skin, rashes and sores.
  • Edema (fluid buildup) in the stomach or lower limbs.
  • Fatigue.
  • Frequent infections.
  • Itchy skin (pruritus)
  • Jaundice.

Do you sleep better with more protein?

Although this study may not apply directly to humans, it is consistent with previous observations that a high-protein diet led to deeper sleep in people. The study adds to a growing body of research showing protein is essential to sleep because it sates animals more than similar amounts of other nutrients.

How much protein a day to lose weight?

If you're trying to lose weight, shoot for 68-82 grams of protein per day. Matt says to split your daily protein intake between your three daily meals. “Your body does a way better job at metabolizing protein when it's consumed 15-30 grams at a time.

How can I check my protein levels at home?

You can buy a simple test kit with urine testing strips at most pharmacies and drugstores. To test your urine each day, dip a urine testing strip into a fresh sample of your urine. Follow the instructions on the kit. Find the results by matching the color of the strip to the color blocks on the container.

Are protein shakes good for you?

When you drink them as part of a balanced diet, protein shakes can support good health. But some people may have the following side effects: Gas, bloating, diarrhea or cramps: If you're lactose intolerant, some whey protein shakes may irritate your stomach. Large servings can also cause constipation and nausea.

Will I lose muscle if I don't eat protein?

When on a weight loss journey, lack of protein is a huge culprit of muscle loss. “Our bodies don't store protein like other nutrients, so it's important to eat the right amount every day,” says Kate. “Everybody is different and will have different protein requirements.

What happens if you eat very little and exercise a lot?

Yes, eating less with a low-calorie diet puts you on the fast track to weight loss—and an intense exercise routine leads to increased metabolism and decreased body fat. In reality, a crash diet and overzealous exercise routine can be hard to maintain which may lead to more weight gain in the future.

What happens if you don't eat enough protein after working out?

“If you aren't eating enough protein, you're going to experience things like physical fatigue, weakness, or pain in your joints or muscles because you're not adequately supporting tissue growth,” says Sarah Wardlaw, MS, L/ATC, CES, a Mass General Brigham athletic trainer with a master's degree in nutrition and ...

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