Why am I gaining weight immediately after working out?

Author: Mr. Sherman Schaefer MD  |  Last update: Sunday, July 13, 2025

Post-Workout Inflammation Exercise causes structural damage to myofibers (cells in muscle tissue); inflammation results due to a build-up of white blood cells in the damaged tissues. 9 This inflammation and build-up of fluid may show up as temporary weight gain after a workout.

Why did I gain weight so fast after working out?

Weight gain after starting exercising or running can be due to muscle development, which weighs more than fat. Increased water retention and inflammation, common during initial workouts, can also contribute. Additionally, a boost in appetite may lead to overeating.

Is it normal to gain weight before losing it while working out?

in the short term, yes, it's probably mostly water. Muscle burning workouts cause water retention as part of the healing process, and your weight can fluctuate by about 5 lbs a month based on hormone cycle, what you've eaten recently, etc.

How long does temporary weight gain after exercise last?

This water retention phenomenon usually lasts 2-3 weeks while your muscles get accustomed to the new routine.

Why did I gain 5 pounds after working out?

This process is known as muscle hypertrophy. Glycogen or sugar that your muscle cells convert to glucose is the energy source for your muscles. When you exercise regularly, your body stores more glycogen to fuel that exercise. This could be the reason for the initial weight gain.

"Why am i gaining weight when i'm eating less and working out?" - simple answer 🚨

How to flush out water weight?

  1. Exercise Regularly. Daily exercise provides several health benefits, including preventing water retention. ...
  2. Drink More Water. Drinking water to reduce water weight sounds counterintuitive, but it helps. ...
  3. Manage Salt Intake. ...
  4. Cut Carbs. ...
  5. Focus on Certain Foods and Herbs. ...
  6. Try Supplements. ...
  7. Up Your Caffeine Intake.

How long does workout bloat last?

“Bloating after exercise should only last for a maximum of a couple of hours. If you're suffering from regular or severe bloating or you've noticed a change in your digestive tract such as different or painful bowel habits then it might be more than just exercise and you might need this to speak to your GP.”

Why am I gaining weight when I'm eating less and working out?

Key takeaways: Working out can cause short-term weight gain as your muscle mass increases. Post-workout inflammation may cause temporary weight fluctuations. Workout plateaus, supplement use, and dietary changes can also stall your weight-loss efforts.

How to get rid of water retention after exercise?

Tips To Minimize Water Retention
  1. Try a low-sodium diet. Simple diet changes can make a big difference. ...
  2. Eat more fruit. ...
  3. Drink more water. ...
  4. Get moving. ...
  5. Consider dandelion root. ...
  6. Wear a compression garment. ...
  7. Elevate your feet. ...
  8. Consider medication.

How long does it take to start losing weight when exercising?

Stage 1: Fast weight loss

In the beginning, weight loss happens pretty rapidly. Over a period of 4-6 weeks, you'll likely see a noticeable difference in your body weight [1] — either on the scales or by the way your clothes fit.

Is it normal to look fatter when you first start working out?

“Per unit volume, muscle weighs more than fat, so shedding fat and gaining muscle may not immediately change the scale but will result in changes in shape, tone, and measurements,” says McGowan. In other words, you may look leaner as you build muscle and lose fat, but you may actually start to weigh more.

Why am I gaining weight if I barely eat?

If you're asking yourself, “Why am I gaining weight when I barely eat,” several factors may be at play. Your body may be holding onto fat stores if your eating habits are inconsistent or restricted. Or, your weight gain may be the effect of a sedentary lifestyle, medical condition, or long-term stress.

How long does it take to see results from working out as a female?

For beginners, you can expect to see initial changes in strength and endurance within 4-8 weeks of consistent participation in fitness classes. These initial gains can be highly motivating, improving your physical strength and cardiovascular endurance and providing a solid foundation for future progress.

Why do I feel fatter right after working out?

There are several research-backed reasons why you might notice a slight weight gain after exercise. These include muscle gain, water retention, post-workout inflammation, supplement use, or even undigested food. In most cases, post-workout weight gain is temporary.

How long does it take to see results from working out 5 days a week?

As a rough guide, you'll probably notice some initial changes in the first four to six weeks, but longer-term changes (what you're working toward) will often take around eight to 12 weeks. The good news is that you're likely to start feeling better quickly.

How long does water weight last?

How Long Does Water Weight Last? The span can vary depending on the cause. Temporary water weight caused by high sodium intake or premenstrual syndrome can last a few days to a week. Permanent water weight caused by underlying health conditions may last longer and require medical treatment.

How long does water retention last when you start working out?

Glycogen binds with water as part of the process, which can add 1 to 3 pounds of initial water weight gain. The effect, however, is short-lived and should end in a few weeks to a month.

How to lose 4 pounds of water weight overnight?

4 ways to lose water weight immediately
  1. Drink more water. It might be a little difficult to believe but drinking more water can actually help you shed water weight. ...
  2. Reduce intake of salt. Too much salt or sodium in your diet may be contributing to water retention. ...
  3. Consume fewer carbs. ...
  4. Exercise.

What is the 30/30/30 rule for weight loss?

The 30/30/30 is a weight loss method that involves eating 30 g of protein within the first 30 minutes of your day and following it with 30 minutes of light exercise. This morning routine is rooted in sound science, and it could be a good way to increase your capacity to burn fat while keeping lean muscle.

How much weight can I lose in 1 month by drinking hot water?

How much weight can I lose in 1 month by drinking hot water? There is no specific weight loss amount attributed solely to drinking hot water, but it can aid in overall weight loss efforts by increasing metabolism and hydration.

How long does post-workout inflammation last?

It's normal to experience muscle swelling and soreness after novel or eccentric-heavy exercise for up to 24-72 hours. You should still be able to perform your daily activities during that time. Remember, this is a temporary phase, and your body will soon return to its normal state.

Why is my belly getting bigger after working out?

“Gastric emptying slows down as blood is redirected to more critical areas, such as the muscles,” she explains. For some people, this may result in a bloated feeling at the end of a workout, particularly after high-intensity exercise or super-challenging core moves.

How do I debloat my stomach?

How to reduce bloating
  1. exercise regularly to improve your digestion and help prevent bloating – exercise can also help when you're feeling bloated.
  2. chew with your mouth closed to avoid swallowing air.
  3. drink plenty of water.
  4. eat foods high in fibre if constipated.
  5. eat smaller, more frequent meals instead of large meals.

Why am I getting heavier with exercise?

Muscle weighs more than body fat

If you've only ever done cardio exercise, you may be confused when a strength-training program leads to weight gain. But the reason for it is simple: Weight training builds lean muscle mass, which is denser than body fat.

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