4. If you give yourself a day off your diet each week
If you work hard to be responsible for your diet all week long, you may feel you deserve to cut yourself some slack over the weekend. A survey by the National Weight Control Registry, though, finds that those who lighten up over the weekends have a 50% greater chance of losing control over their weight than those who always stay vigilant. It’s a much better idea to maintain a practical level of self-control and never let it up.