Step 6: Build a support team
Some people lose weight with the help of a diet buddy, but for the best chance of success, you need the support of people whose decisions will affect your efforts.

"When you make systemwide changes, your actions affect many people," Alemi says. "If you plan to lose weight by changing your food-shopping and cooking habits, then everyone at home will be affected. You're better off to engage them from the start."

Start by educating these friends and family members about weight loss in general (including what lifestyle changes are necessary) and your goals in particular, then involve them in your daily experiments. "The whole group needs to agree to rely on the data," Alemie says. As results of your changes come in, including new, healthier habits, share them with the group.

After all, when you finally do solve your weight problem, these people are the ones who will help you celebrate your success. They may even thank you for helping them, too.