List shows the healthiest foods for losing weight - number 1 is a real long-running favorite. An adult should drink 1.5 liters of water or unsweetened tea every day.

Buttermilk can also help you lose weight because it has few calories, a lot of calcium and keeps you full for a relatively long time. But the absolute number 1 among fat-killing drinks is lemon water: it not only stimulates digestion, it also has a detoxifying effect and boosts the immune system.