Can you gain muscle while undereating?

Author: Miss Felicita Christiansen MD  |  Last update: Friday, July 18, 2025

Gaining Muscle When Eating Less If you want to lose weight and still build muscle, it's possible as long as you find a balance in your routine, which includes: Eating enough protein: The body uses protein to build muscle, so you need to eat enough for your body to convert to muscle tissue.

Can you gain muscle undereating?

No, it is not possible to gain lean muscle while eating fewer calories than your body needs to maintain its current size/weight. In order to build muscle, you need to create a slight caloric surplus and provide your body with enough protein to support the muscle growth.

Can I still build muscle if I eat less?

No, it is not possible to gain lean muscle while eating fewer calories than your body needs to maintain its current size/weight. In order to build muscle, you need to create a slight caloric surplus and provide your body with enough protein to support the muscle growth.

Can you gain muscle while not eating?

Intermittent fasting could potentially be bad for muscle growth. If fasting means you're not getting enough calories, your workout performance and recovery can slip, leading to fewer muscle gains.

Is 1500 calories a day enough to build muscle?

1500 is enough to build muscle for a very short, very fat, completely untrained person. The amount you need to build muscle efficiently is typically your tdee + at least a few hundred calories. If you have noob gains, excess energy stored as fat, and a low tdee, then 1500 might be enough.

How to sustainably lose fat while maintaining muscle | Peter Attia and Derek MPMD

Can I gain muscle while in a calorie deficit?

Studies have shown that participants can gain muscle, even while in a caloric deficit, as long as they eat enough protein. It's important enough that I'll say it again: If you don't want your body cannibalizing its muscles while you are in a caloric deficit, you need to eat plenty of protein.

How can I bulk in 7 days?

Nutrition: The Foundation of Bulking

Caloric Surplus: You want to eat in a caloric surplus to bulk up in 7 days. This means consuming more calories than your body burns. Calculate your Total Daily Energy Expenditure (TDEE) and add 500-1000 calories per day to it. This extra energy will fuel muscle growth.

Will I lose muscle if I barely eat?

Even if you want to lose body fat, which does require a calorie deficit, cutting calories too much can cause you to lose muscle rather than maintaining muscle while burning fat. Watch out for clear signs that your body isn't getting enough nutrients as a cue to eat more for better gains, Asche said.

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

To make gains you have to have the right nutrients in your body to construct muscle. This means that what you eat, and how much, is essential in making muscle gains. Lifting and doing strength training without adequate nutrition, especially without enough protein, can actually lead to loss of muscle tissue.

Do I really need to eat a lot to gain muscle?

The general rule is that consuming an excess of at least 2,500 calories per week can help increase lean tissue by one pound of gained mass. This number is derived from several published studies, but it is generalized for the 'average exerciser. ' For muscle hypertrophy, your client may need even more excess calories.

What happens if I lift weights on a calorie deficit?

Interestingly while a calorie deficit can impair muscle growth, it doesn't necessarily stop you from gaining strength. A recent review found that while those training in a calorie deficit saw impaired muscle growth, their strength gains weren't affected.

How much protein is too much?

The researchers found that consuming more than 22 percent of daily calories from protein carries more downside risk than dietary benefit. For a normal adult, 20 to 30 grams of protein per meal, or 60 to 90 grams of protein per day is adequate to support health.

Will I still gain muscle if I eat less?

Can You Be in a Calorie Deficit and Gain Muscle? For some people, yes, it is possible to build muscle in a calorie deficit. For example, those who are new to resistance training and/or have higher BMIs may find a heightened response to lifting weights and experience greater losses of fat mass in a calorie deficit.

What happens if you don't eat and go to the gym?

However, exercising on an empty stomach will also cause you to lose lean muscle mass at the same time, which can hinder long-term weight loss. Exercising without eating first can cause dramatic shifts in your blood sugar, and when it drops quickly you can feel nauseous, light-headed or dizzy.

How long do newbie gains last?

How Long Do Newbie Gains Last? Anecdotally, newbie gains can last between 6-12 months or even a bit longer depending on various factors. Taking advantage of this timeframe is one of the wisest life investments a person can make considering the effort/time to reward ratio.

Will your muscles grow if you don't eat enough?

Your body needs protein for muscle building and repair tissues, so if you aren't eating enough, your muscles won't have the material they need to grow. You could feel “punch drunk” after working out, your arms and other muscles might ache more than usual, and your body may even feel generally weaker.

Is 1000 calories a day a deficit?

The Bottom Line. A calorie deficit of 1000 calories per day can result in rapid weight loss, however this diet is difficult to stick to (some may not even make it for more than a week) and can have unpleasant side effects.

How do I know if I've gained muscle?

5 Secret Signs You're Building Muscles
  • Increased Strength. Even without documented muscle growth, you're making gains if you're getting stronger. ...
  • The Scale is Going Up. ...
  • Your Workouts Feel Easier. ...
  • Your Posture Is Better. ...
  • You're Recovering Faster from Your Workouts. ...
  • Summing It Up.

How to lose 5 lbs in 5 days?

Lose 5 pounds in 5 days? It's as easy as 5, 4, 3, 2, 1 ...
  1. Drink two glasses of water before each meal.
  2. Have three protein rich meals. ...
  3. Dance to four of your favorite songs. ...
  4. Eat five cups of veggies every day. “Vegetables are high volume; they're low calorie; and they fill you up and not out,” Bauer said. ...

Do your muscles hurt if you don't eat enough?

Deficiencies in vitamin D, thiamine, and phosphorus can cause muscle weakness throughout the body, too. Having anorexia and muscle pain or general weakness is a common experience among those suffering from the eating disorder.

Why do bodybuilders eat less?

A cutting diet reduces a person's calorie intake to lose body fat while maintaining muscle mass. Cutting diets typically prioritize lean proteins, nutrient-dense vegetables, and whole grains. Bodybuilders and fitness enthusiasts often use a cutting diet after a bulking phase to achieve a leaner physique.

What is dirty bulking?

There are other terms for this, such as build mode, but bulking is a common term for this caloric surplus. Dirty bulking is when an individual is in a caloric surplus to build muscle (build mode). However, the individual is eating foods that are carb dense, unhealthy, and ultra-processed out of convenience.

Can you gain 1 lb of muscle in a week?

However, someone who has a way to go in making gains, but is not a total gym neophyte, can gain from 1 to 2 pounds of muscle per week initially,” says Wisconsin-based strength coach Pat Gilles, C.S.C.S.

Why do bodybuilders eat rice?

Extreme exercise requires eating plenty of carbs. It is recommended athletes consume 60g/h of carbohydrates for prolonged exercise lasting more than two hours. White rice is considered a safe starch to consume prior to exercise, easy on the stomach, and has been shown to meet sports nutrition recommendations.

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