Take our FREE 1 Minute Quiz to find out EXACTLY what Diet & Training is Best for You.


Take our FREE 1 Minute Quiz to find out EXACTLY what Diet & Training is Best for You.

If you’ve ever looked in the mirror and asked yourself, “Why am I gaining weight?” then you know the frustration of trying and failing to get fit. It feels a lot worse when you’re actually working out. There’s no such thing as weight gain for no reason, and that’s what you’re about to find out.

Why Am I Gaining Weight? | Top Reasons Why You’re Adding Pounds Despite the Workouts


1. Poor Diet

Poor Diet | Why Am I Gaining Weight While Working Out? | gaining weight too fast
Sometimes the answer to the question “Why am I gaining weight despite my workouts?” is very simple. It might be your diet.

Diet is a complex subject, and it’s personal. Like a workout, it can differ from one person to another. Certain dietary habits, though, can give you reasons for “sudden weight gain.”

For example, you may be consuming more calories than you burn. A super-intense hour-long workout may be 1,000 calories for men and 750 for women (and that’s pretty high). A cheeseburger with fries and a milkshake is about 2,000 calories. So the age-old “I’ve been virtuous, so I’m going to Gordo Burger” thinking has to go.

A diet that’s high in sodium (which usually happens when you’re eating processed food) can also be a cause. Too much of it in the body can lead to water retention and bloat.

Exercise and diet will always go hand in hand. In fact, a healthy lifestyle is about 70 percent good diet and 30 percent right exercise.

Remember as well, you can’t offset unhealthy eating habits with working out. Besides, eating a poor diet can have long-term implications for your health. They may cause hormonal imbalance. It may be the reason for the unexplained weight gain in women.

2. Water Retention

Water Retention | Why Am I Gaining Weight While Working Out? | gaining weight too fast
If you’ve been asking, “Why am I gaining weight?” for some time now, it could be because you’re retaining water. In fact, a lot of cases of unexplained weight gain is because of this.

The question is why. When you begin working out, you’re putting stress on your muscles. The fibers break and tear. These micro tears won’t hurt you. They’re a necessary part of the fitness process.

They do represent trauma and injury to the body, though. You experience inflammation. In turn, the body keeps as much water as it can since it needs fluids to heal the area.

It’s also possible you’re retaining water because you’re dehydrated. The body works on achieving homeostasis. It’s the state of being balanced. If it feels you’re not having a lot of fluids, it holds on to your reserves.

There are different ways to know if you have water retention. You may have abdominal bloating and weight gain. You may develop stiff joints. Your face may even look puffy.

The good news is, over time, your muscles will toughen up. Your body will get used to the exercise and prevent the inflammatory response. To avoid dehydration and bloating, drink more water.

3. Muscle Expansion

Muscle Expansion | Why Am I Gaining Weight While Working Out? | gaining weight too fast
Do you ask, “What causes weight gain without overeating?” It can be your muscles hard at work. When you work out, your muscles start to bulk up. The tissue your body replaces torn muscles with is denser and more fibrous. Muscles are denser than fat, so they can increase your weight gain.

The nice thing about muscles is they tend to be compact than fat. You still look lean. It explains why two men or women can have the same weight but look vastly different in terms of shape.

Another potential reason is you’re building muscles faster than losing fat. It’s not something to be scared of. As long as you’re doing your workouts right, you will lose the excess fat. They will leave you with more defined and toned muscles.

Warning: Never Ignore Consistent Unexplained Weight Gain

In most cases, the answer to the “Why am I gaining weight?” are the three factors above. It doesn’t mean, though, you should not be worried. For one, there are medical reasons for weight gain.

One of the diseases that make you gain weight is hypothyroidism. It leads to putting on weight for no reason, especially among women. It’s a thyroid issue that affects the body’s metabolism. It needs the support of a doctor. You may also be gaining weight due to the medications you’re taking.


Struggling with overeating? Get my three tips to stop doing it fast:

In the end, don’t immediately fret and ask “Why am I gaining weight?” when you’re working out. It can be your body adjusting to the changes.

Besides, only looking for immediate results is a slippery slope when working out. However, always pay attention to your weight gain. Gaining weight without reason isn’t normal. When necessary, consult your doctor about it.

Pace well with your workouts and diet. Find the right plan for you by taking this free 1-minute quiz.

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