Why am I eating less and gaining weight?

Author: Theresa Stoltenberg  |  Last update: Thursday, January 22, 2026

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.

Is it normal to gain weight before you lose it?

Yes, it's common to experience temporary weight gain before starting to lose weight, especially when beginning a new exercise or diet routine. This can be due to factors like water retention, muscle gain, or changes in eating habits.

Why am I gaining weight even with a calorie deficit?

Weight gain in a calorie deficit can happen for several reasons. First, you might be underestimating your calorie intake, either by not accounting for small snacks or drinks. Also, changes in metabolism, water retention, hormonal fluctuations, or muscle gain (which weighs more than fat) can impact the scale.

Why am I gaining weight when I have no appetite?

It is unusual that weight gain can accompany decreased appetite, but certain conditions such as depression can produce changes in eating habits and day-to-day changes in appetite. Fatigue is a symptom that can accompany many infections and other conditions.

Why do I keep gaining weight if I don't eat much?

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.

Why You Might Not Lose Weight (and Even Gain Weight) When You Eat Less and Run More

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.

Can eating too little cause weight gain?

We know that overeating and cutting healthy foods out of our diets can be an issue for weight loss, but undereating is less commonly addressed. One of the signs of undereating is finding that you're not only not losing body fat, but you may actually be seeing some weight gain.

How do I speed up my metabolism?

5 ways to boost metabolism
  1. Exercise more. Add interval training to your cardio routine and burn more calories in less time. ...
  2. Weight train. By adding muscle mass to your body, you can burn more calories at rest. ...
  3. Don't skip meals, especially breakfast. ...
  4. Eat fat-burning foods. ...
  5. Get a good night's sleep every night.

How often should I weigh myself?

Aim to weigh yourself on the same day, at the same time and in the same environment each week – for example, first thing every Friday morning when you're getting ready to take a shower, after you've gone to the bathroom, but before you've drunk or eaten anything.

Which body part loses fat first?

Mostly, losing weight is an internal process. You will first lose hard fat that surrounds your organs like liver, kidneys and then you will start to lose soft fat like waistline and thigh fat. The fat loss from around the organs makes you leaner and stronger.

How do you reset your body weight set point?

After you maintain your new, lower weight for 6 months, you can repeat the cycle and reset your set point again by losing another 10%. Through small, gradual changes in your daily habits, you'll be able to stay at that new, lower weight for the rest of your life.

What illnesses make you put on weight?

In some people, obesity can be traced to a medical cause, such as hypothyroidism, Cushing syndrome, Prader-Willi syndrome and other conditions. Medical problems, such as arthritis, also can lead to decreased activity, which may result in weight gain.

How long does it take to lose 20 pounds?

To lose weight effectively and safely, aiming to lose 1 to 2 pounds (lbs) per week may be best. This means that losing 20 lbs may take 10 to 20 weeks. To lose weight, people will likely need to follow a healthy diet and get regular exercise. Some popular diets are effective initially but challenging to maintain.

Why do I look fatter when I eat less?

When cortisol goes up, our bodies may hold onto more water, which means we feel “softer” and “less lean” than we actually are. This water retention can mask the fat loss that is occurring, making it seem like we aren't losing fat and weight, when in fact we are.

What burns fat the fastest?

  • Strength training. Working out is the best way to burn fat. ...
  • Eat more protein. ...
  • Get your eight hours of sleep a night. ...
  • Increase your soluble fibre intake. ...
  • HIIT workouts. ...
  • Cut down on sugar. ...
  • Start your day with exercise. ...
  • Eat more slowly.

What is the best drink to speed up metabolism?

Top 10 Drinks That Increase Metabolism And Burn Fat
  • Black Tea. ...
  • Water. ...
  • Apple Cider Vinegar Drinks. ...
  • Ginger Tea. ...
  • High-Protein Drinks. ...
  • Vegetable Juice. ...
  • Kombucha Drink. Kombucha is that fizzy, fermented tea everyone's been raving about! ...
  • Lemon Water. Lemon water is one of the simplest and most refreshing drinks out there.

Why am I gaining weight despite eating less?

Weight gain on a restricted diet can be caused by underestimating calorie intake, eating the wrong types of foods (like processed foods), or not exercising enough.

How to tell if your body is in starvation mode?

Symptoms of Starvation
  1. Feeling Cold. A study published in the journal Aging found that calorie restriction lowers the core body temperature, so a person may feel extremely cold.
  2. Lethargy. ...
  3. Constant Hunger. ...
  4. Constipation. ...
  5. Depression. ...
  6. Hair loss. ...
  7. Missing Periods. ...
  8. Mood Swings.

Why am I gaining weight on 1500 calories a day?

Your body composition may be another reason why you are still gaining weight while in a calorie deficit. If you have a higher body fat percentage and lower muscle mass, then you are probably burning fewer calories than if you had more muscle mass.

What kills water weight?

Water weight is not usually a cause for concern, but it can be uncomfortable and recurring. Reducing salt and carbohydrate intake, keeping hydrated, and frequently exercising are all good ways to lose water weight and prevent it from returning.

How to lose belly fat fast?

8 Ways to Lose Belly Fat and Live a Healthier Life
  1. Try curbing carbs instead of fats. ...
  2. Think eating plan, not diet. ...
  3. Keep moving. ...
  4. Lift weights. ...
  5. Become a label reader. ...
  6. Move away from processed foods. ...
  7. Focus on the way your clothes fit more than reading a scale. ...
  8. Hang out with health-focused friends.

Previous article
Are thick thighs a good thing?
Next article
Can hair follicles be activated?