No, cardio does not make you fat. If you're gaining fat, it's because you consume more energy than you burn.
Too much cardio makes you lose muscle mass and this makes your metabolism slow. As a result, the fat burning mechanism in your body slows down. Thus, your weight-loss results won't be as quick as they used to be. This is usually because the body hasn't recovered from the previous day's workout involving excess cardio.
If you have been exercising and still have belly fat, you could be doing the wrong style training, your stress levels may be too high, or you may have an endocrine disorder like polycystic ovary syndrome.
When you exercise regularly, your body stores more glycogen to fuel that exercise. Stored in water, glycogen has to bind with water as part of the process to fuel the muscle. That water adds a small amount of weight, too.
Doing cardio in excess can increase the risk of more muscle burn. This happens as the body struggles to keep up with the increased level of energy. It weakens your metabolism and hampers the process of weight loss.
If you only do one kind of exercise, every day, you put your body at risk of overuse injuries. Cardio is a major culprit of this because movements like running and jumping put so much pressure on your joints. Injuring yourself out of your workout routine will definitely be a setback to your weight-loss goals.
Actually, performing too much cardio will put your body in a catabolic state and burn hard-earned muscle. The loss of muscle will not only reduce strength, but it will also slow down your metabolism. If your metabolism slows down too much, you'll have a tough time burning fat.
“When you start exercising, your muscles start gobbling up fuel called glycogen,” says Krista Scott-Dixon, Ph. D., Director, Headspace Adjustment Bureau, Precision Nutrition. Since glycogen stores water, you could gain up to 10 pounds in water weight alone, says Scott-Dixon.
This surge of fluids causes your muscle cells to swell up, making your muscles look larger than usual. When you get a muscle pump, it might feel like your muscles are "full," in a sense. Read more: Cardio before or after weight lifting?
You've Gained Muscle Mass
If you're exercising regularly and doing a mix of cardio and strength training, it's very likely your body composition (ratio of muscle to fat) is changing for the better. If you're gaining muscle while losing fat, the scale may not show any weight change.
Your genetics prefer storing fat in your stomach area
Visceral fat—the type of fat the body stores in your abdomen and around your intestines and is mostly responsible for keeping people from a flat belly—can be partly determined by genetics.
One reason belly fat is so hard to lose is that it's considered an “active fat.” Unlike some fatty tissue that simply sits “dormant,” belly fat releases hormones that can have an impact on your health — and your ability to lose weight, especially in the waist and abdomen areas.
You're Into the Wrong Foods
Unhealthy eating is the biggest driver of big bellies. Too many starchy carbohydrates and bad fats are a recipe for that midsection to expand. Instead, get plenty of veggies, choose lean proteins, and stay away from fats from red meats.
If you really start pushing the limits, you'll experience symptoms of overtraining. Basically, if you are having trouble sleeping or waking up, getting sick easily, are sore all of the time or feel more irritable than usual, then your body is breaking down from too much cardio.
For most healthy adults, the Department of Health and Human Services recommends these exercise guidelines: Aerobic activity. Get at least 150 minutes of moderate aerobic activity or 75 minutes of vigorous aerobic activity a week, or a combination of moderate and vigorous activity.
1 to 2 weeks for cardio loss
“It's the first thing that starts to decline - you will likely feel a small difference after 1 week without exercise. After 2 weeks, there is significant loss”, says Carly.
While sweating is a healthy way to release build-up and impurities, it can also clog up your pores, causing breakouts and other skin issues on your face and throughout your body, especially if you are wearing heavy makeup or other acne-causing products.
According to Noah Abbott, a CrossFit coach in Brooklyn, prolonged, steady-rate cardio can deplete our body's Triiodothyronine, or T3 hormone. This hormone is responsible for metabolism, and a depletion of this hormone can cause the body to go into a mode where it stores and gains more fat than usual.
Fats, protein, and carb imbalance.
Having too many fats—even healthy ones—at every single meal can slow your weight-loss progress. This is true for any macronutrient consumed in excess, but dietary fat is more than double the caloric density (9 kcal per gram) of protein and carbs (both 4 kcal per gram).
Weight gain
Exercising too much without resting enough in between can lead to low testosterone levels and high levels of cortisol, the stress hormone. These hormonal changes are often associated with loss of muscle tissue, weight gain, and excess belly fat.
Muscle is denser than fat, and as it is more compact within your body, as you gain muscle mass, you end up looking thinner, no matter your physical weight. So, if you've been doing a lot of strength training lately, it's likely this is the reason that you're looking fantastic but not dropping those numbers.
The best types of cardio to aid in weight loss are either low-impact, low intensity cardio like rowing, incline walking, and biking, or HIIT workouts implemented in small doses such as kickboxing, interval training, and weight training.
Stick to two to three days of cardio per week. Focus on shorter, higher-intensity sessions, such as 25 minutes of HIIT.
The more you exercise, the more calories you'll burn. If you're trying to lose weight, you should aim for doing cardio at least five days per week for a total of at least 250 minutes (4 hours, 10 minutes) each week. Contrary to what many believe, you can do aerobic exercise seven days per week.