8 No-Brainer Tricks to Save Around 100 Calories in a Day

Choose Snack Foods with Shells

A handful of pistachios is about a quarter of a cup—about 82 calories. To clarify, that's pistachios in the shell. If you fill that same quarter cup with nuts already shelled, you may save time and energy, but you'll gain an extra 100 calories. (And don't worry about cleaning up the shells of pistachios, peanuts or walnuts right away: Studies show that leaving them around can unconsciously remind you of how many you've eaten and deter you from wanting more.)