Everyday health.com offers this tip for losing 20 pounds:

Cutting out sweet drinks is non-negotiable. Sweet tea, soda, and flavored and sweetened milks, waters, and coffees all have to go. Drink plain water, low-fat milk, and sugar-free drinks instead. A study of 810 adults between 25 and 79 years old showed that after 18 months, those who cut out sweet drinks had greater weight loss than those who cut down on food calories. One possible reason: While your body lets you know when it is full of food, there is no way for your body to tell you when you’ve maxed out on liquid calories.