How to fight after 40
You'll gain 30lb a year if you eat the same in middle age as you did in your 30s. But don't despair! A new book reveals how you can stay trim By LUCY CAVENDISH UPDATED: 05:03 EST, 30 January 2012 Comments (129) Share Losing weight in your 20s and 30s is simple: just eat a bit less, move a bit more. Back then, I ate…