"Coffee increases metabolism because its main component, caffeine, is a stimulant that enhances your metabolic thermogenesis, which is the process by which the body generates heat from digested food substances,"
says Daniel Boyer, MD, a medical researcher in Des Moines, Iowa, who studies molecular biology and pharmacology, among other things, and is affiliated with the Farr Institute.
According to Harvard Health Publishing, having a high metabolism implies burning more calories throughout the day, whether you're active or not.
"This means a faster metabolic rate promotes a quicker weight loss than a slower metabolic rate," said Dr. Boyer.
According to the Mayo Clinic, drinking coffee can help people feel full. This could have an impact on your weight because if you don't seek for extra meals and snacks during the day,
you may consume fewer calories in total. Excess calorie intake is a primary cause of weight gain, according to Boyer.
A review published in April 2017 in the International Journal of Food Sciences and Nutrition discovered that individuals who ingested caffeine 30 minutes to 4 hours before mealtime consumed less food.
However, other studies have not proven this link, so don't base your diet on this effect.