London: Muscle does not turn into fat when people stop exercising, despite a common belief among those returning to fitness after a long break, according to experts.
Prof Leigh Breen, a specialist in muscle physiology at the University of Leicester, stated that muscle and fat are two distinct types of tissue, with no biological process that converts one directly into the other.
The misconception often arises because the body can undergo changes when regular exercise, particularly resistance training, stops. When people reduce or stop strength training, they may gradually lose some of the muscle mass they developed through exercise.
At the same time, continuing to consume the same number of calories while being less active can create an energy surplus, potentially leading to an increase in body fat.
The combination of reduced muscle mass and increased fat mass can change the body’s appearance, making it seem as though muscle has transformed into fat. However, these are separate processes.
What Happens When You Stop Exercising?
The extent of physical changes depends partly on how long a person remains inactive and how much movement they maintain during the break.
People who take a couple of weeks off their usual training routine but continue with everyday activities are likely to experience fewer changes than those who remain completely immobilised for an extended period because of an injury.
Diet also plays a role in maintaining body composition during a break from exercise. Maintaining adequate protein intake can help support muscle maintenance, while a modest reduction in calorie intake may help account for lower energy expenditure.
Maintaining Muscle and Healthy Habits
Small changes in muscle and fat mass during breaks from training are generally normal. The effects can vary depending on activity levels, dietary habits, and the duration of the break. Consistent exercise and balanced eating habits over months and years are important for maintaining muscle mass and managing body fat.
Understanding the difference between muscle loss and fat gain can help people approach exercise breaks with realistic expectations and return to their routines without unnecessary concern about changes in their bodies.
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