Here is a smart belt that stays around your waist and uses sensors to count your steps and monitor your waist in real-time to detect overeating patterns. WELT can sense waist sizes from 28 to 44 inches. It can also track how long you have been sitting.
When you overeat, WELT detects rapid variations in waist size to keep you honest. The data will be made available on your smartphone. More info is available on Kickstarter.