Since stawberries are on season its also the best time for a strawberry diet. One cup of strawberries constitutes 45 calories that makes up a 188 KJ. Want to try this power up drink to start the day? Prepare this strawberry smoothie during breakfast. Just add soya milk and yogurt to a 1 cup strawberries, place in a blender, cover and blend it till smooth. See it for yourself how powerful it is, in just one day you can lost 2 pounds.