Fresh strawberries are always a treat, and you can find locally grown varieties throughout the summer in most areas. Unfortunately, conventionally grown strawberries rank among the top 10 pesticide-ridden fruits and vegetables, so always choose organic. Look for berries that are red all the way to the tip, a sign that they’re fully ripe (strawberries don’t ripen after picking). One cup of sliced strawberries has 53 calories.