) -- http://physics.nist.gov/Pubs/SP811/footnotes.html#f11
Calories are a unit of energy that our body uses for various functions such as breathing, digestion, and physical activity. They are burned through a process called metabolism which converts food into energy.
Our body constantly burns calories even when we are at rest. However, we can estimate the number of calories burned by tracking our physical activity levels and using tools such as fitness trackers or calorie calculators.
Some foods and drinks, such as caffeine and spicy foods, have been shown to slightly increase metabolism and burn more calories. However, the effect is minimal and the best way to burn calories is through regular physical activity and a balanced diet.
Yes, muscle mass plays a significant role in how many calories we burn. The more muscle mass we have, the higher our metabolism and the more calories we burn at rest. This is why strength training is an important component of weight loss and weight maintenance.
While tools such as fitness trackers and calorie calculators can give us a general estimate, it is important to remember that the number of calories burned can vary based on individual factors such as age, weight, and fitness level. It is best to focus on overall lifestyle habits rather than obsessing over exact numbers.