Good news: Calories don't really count. That's what Dr. Oz and Dr. Roizen say, and I'm inclined to believe them. Here's how they explain: Counting calories isn't really worth it because eating isn't about calories; it's about satisfaction. Plus, each one of us has different caloric needs, depending on our genes, metabolic rates, activity levels, and other factors. There just is no one-size-fits-all calorie formula. For some people, larger portions may be reasonable; for others, small may be sufficient.

Now that you've got permission to ditch the calorie-counting, embrace these four tips for eating and exercising wisely.

• Eat nutritionally-rich foods.
• Avoid toxic foods -- simple sugars and carbohydrates; saturated and trans fats; cereals, pastas, grains, and flours that are not 100% whole wheat or whole grain.
• Use your body's clues -- eat the amount of food that feels right in order to reach and maintain your ideal waist size (32.5 inches for women; 35 for men).
• Walk daily and lift weights three times per week.