Friends and family can make or break a diet and workout plan, whether it's wolfing down nachos in front of you during the football game or the temptation you with a beer. Worse, some people will deliberately try to sabotage your diet, just for sport. Want some ice-cream?

Fix your head: Admit you need support. Recruit a trustworthy friend to diet or work out with you.

Fix your routine: Eat a meal replacment bar before meeting friends, so you’ll feel fuller. Drink a glass of water for every glass of beer. A time-tested strategy: Having someone to answer to is the best enforcement plan.