I met up with a friend today for dinner, and amongst other topics we ended up on the subject of weight loss. I'm currently calorie counting and aim for between 1200-1500 calories a day, however upon hearing this my friend started spouting off information about how this wasn't healthy and I would send my body into starvation mode.
I've tried to read up about this online but it's all very confusing. Could someone explain it to me, and does it actually exist?