Negative Calorie Foods

I love friuts and vegetables but I never knew the difference it could make for a healthy life. When I came through this term "negative calorie foods", I was surprised. Can food contain negative calories? In short, an apple has 60 calories but it takes 100 calories to digest it. So that's the idea. Surprising, but seems to be true. Then, I tried making milkshake out of apple..no luck..even without sugar it doesn't work. So maybe that's why we're advised to eat whole fruits than drink fruit juices. Chewing consumes calories !! I was a bit worried in putting on 1 kg after a vacation. So I thought of trying this out. I just skipped my regular lunch. I had a mix of 3 fruits water-melon, apple and mango (lot of calories) for lunch for 2 days. Then I altered my dinner the next day with vegetable salad.. cabbage, carrot, cucumber, tomato. I've lost altogether 1 kg in 3 days. I never felt hungry. What it means to me .. if I can alter my normal diet to contain these salads and fruits, it means I can have my favourite ice-cream without worrying about putting on weight :-) and in turn stay healthy !!. For more information, Negative Calorie 1 Negative Calorie 2