Having trouble losing weight? This little patch is about to change all that. It’s being produced by a company called PhiloMetron and here’s how it works: slap it on your arm and sensors will measure your energy and calorie intake. From there, the data is beamed to your phone via Bluetooth where you can measure how much you’ve eaten in a day. Afterwards, you can cry and commiserate over a box of Girl Scout Cookies. Enjoy.