Black coffee can lose weight, with lower calories, which can promote fat metabolism. But drinking black coffee to lose weight should pay attention to several small details: 1. Control amount: Although black coffee can accelerate fat metabolism and play a role in losing weight, the more, the better. Do not drink more than 750ml of black coffee every day. Excessive intake of caffeine excites the central nervous system and speeds up the heartbeat, leading to dizziness, palpitations, irritability, anxiety and insomnia. 2. Choose the right coffee: Only coffee with purity greater than 75% can lose weight. Because black coffee is rich and bitter, many people find it hard to accept it, so sugar cubes, condensed milk or granulated sugar will be added, but it will increase its calories, disrupt fat decomposition and aggravate obesity. When drinking black coffee, you can add a small amount of low-fat or skim milk to taste. 3. Choose the right time to drink black coffee: After drinking black coffee for half an hour, the fatty acid content in the blood reaches its peak. At this time, cooperating with exercise can speed up the decomposition of fat and improve the effect of losing weight, so it is best to drink black coffee 30 minutes before exercise. 4. Choose hot black coffee: Caffeine can only play a role when you are in a hot drink state, so choose hot black coffee, which can promote blood circulation and achieve the effect of losing weight.