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Why Some People Lose Weight Eating More Than You

Dr. Kona Lakshmi Kumari, Minimal Access & Robotic GI Surgeon, Metabolic and Bariatric Surgeon, Yashoda Hospitals, Hyderabad

We all know someone who says they “eat all the time” yet never gain weight. Meanwhile, others feel like they barely eat but still struggle with weight gain. It may seem unfair — but the explanation lies in how the body burns and uses energy, not just how much food is on the plate.

At the center of this discussion is metabolism.

Understanding Metabolism: More Than Just Digestion

Metabolism is the process by which your body converts food and drinks into energy. Even when you are resting, your body burns calories to breathe, circulate blood, regulate hormones, and repair cells.

The calories your body uses at rest are called your Basal Metabolic Rate (BMR). BMR accounts for the largest portion of daily calorie burn. However, BMR varies from person to person due to genetics, body composition, age, and sex.

Some individuals naturally burn more calories at rest. Others burn fewer. That difference alone can affect weight over time.

Muscle Mass: The Silent Calorie Burner

One of the biggest factors influencing metabolism is muscle mass. Muscle tissue burns significantly more calories than fat tissue, even when you are not exercising.

People with higher muscle mass have a higher resting metabolic rate. This means they can often eat more without gaining weight. Regular strength training helps preserve and build muscle, which supports long-term metabolic health. With aging, muscle mass naturally declines. This can lower metabolic rate and make weight management more challenging.

Hormones and Metabolic Health

Hormones also play a key role in how the body stores and burns fat. Conditions such as insulin resistance, polycystic ovary syndrome (PCOS), fatty liver disease, or hypothyroidism can make fat storage easier and fat burning harder.

Sleep deprivation and chronic stress raise cortisol levels, which may increase appetite and fat accumulation. These biological factors can influence weight independently of calorie intake alone.

Daily Movement Matters More Than You Think

Beyond structured exercise, the body burns calories through everyday movement — known as non-exercise activity thermogenesis (NEAT). Walking, standing, fidgeting, and household work can account for hundreds of calories per day.

Some people who appear to have a “fast metabolism” may simply move more throughout the day without realizing it.

Is It Just Calories In vs. Calories Out?

Weight change ultimately depends on the balance between calories consumed and calories burned. However, the “calories burned” side of the equation differs significantly between individuals.

Slow metabolism alone rarely causes major weight gain. More often, weight differences reflect a combination of genetics, muscle mass, hormones, sleep, stress, diet quality, and activity levels.

Conclusion

It is not laziness,  it is physiology. Instead of focusing only on eating less, focus on improving how your body burns energy. Build muscle through strength training, move consistently, sleep well, manage stress, and support hormonal health.

Weight management is not just about how much you eat,  it is about how efficiently your body uses what you eat.