Is black coffee the right way to lose weight? The best time to lose weight by drinking coffee in the office: from 30 minutes after lunch to 1 hour, tasting a cup of strong coffee without sugar with your partner will help digestion after meals and promote fat burning. Have another cup of coffee before work to accompany the walk. (1) The key to slimming coffee; No sugar. If you are not used to the bitter taste of coffee, you can add a little milk, but never add sugar, because sugar will hinder the decomposition of fat. Hot coffee is more effective than iced coffee. Hot coffee can help you burn calories faster. Light roasted coffee is the most effective. Coffee with high baking temperature has a strong taste, but less caffeine content, which is not conducive to weight loss, while American coffee with a lighter taste is more conducive to weight loss.