Potatoes contain a lot of starch and carbs. This is why most dieters are trying to avoid potatoes. The good news is that potatoes do not contain too many calories. There are only 70 calories per 100 grams while 100 grams of apples contain 50 calories. As you can see, the difference is not huge. What is the problem then? Well, the secret is to learn to prepare potatoes. Baked, grilled or boiled potatoes are great. Eat them with green vegetables and you will provide your body with vitamins, minerals and fiber to keep you strong and slim.