Microsoft is developing a bra designed to help women with both their emotional and physical health. The sensors inside it detect heart rate, sweat, and stress levels which indicate the potential for over-eating. The bra can also connect to your smart phone to send you a "mood-triggered eating alert" as well as give you suggestions on how to redirect your brain to do something else.
The idea of a 'smart undergarment' has been marketed to women because of research that says they are most likely to emotionally over-eat. The current prototypes are not perfect; the battery life only lasts 3 to 4 hours.