Several factors affect how slowly or quickly you burn calories. And here are the six that played the biggest role in this process.
Body weight. As a general rule, the heavier you are, the more calories you burn during exercise. One study found that up to 43% of the difference in total calorie burn between people could be explained by different sized internal organs. This is one of the many reasons why losing weight is so difficult. Additionally, when you lose weight, hormones make you feel hungrier.
muscle mass. People who have more calories burn more calories than people who weigh the same weight but have less muscle. If you want to speed up your calorie burn, consider strength training.
Ground. Men tend to burn more calories during exercise and at rest than women. This is because men are generally larger and have more muscle mass than women. Additionally, women are genetically predisposed to store more fat to support hormone production and childbearing. The American Council on Exercise (ACE) states that men need at least 2-5% body fat to survive, and women need at least 10-13% body fat.
Age. As we get older, we all begin to lose muscle mass. After 30 years, we lose 3-5% of our muscles every 10 years. This also reduces your metabolic rate. A 2021 study also found that metabolic rate tends to plateau between ages 20 and 60, then begins to decline.
fitness level. The more you do a particular workout, the easier it seems. As the body adapts to the load, you burn fewer calories over time with the same exercise.
Training intensity. Those who exercise at high intensity burn twice as many calories as someone who exercises at low intensity for the same amount of time. One study found that adults who walked 1 mile burned about 89 calories, while those who ran the same distance burned about 113 calories.
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Source: Ferra

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