What causes obesity? A major new study is upending common wisdom.

To try Dr. Taz's approach, start by aiming for 90 grams of protein, 40 grams of fiber and 50 grams of fat a day. Sample meals (at right) have about 30 grams of protein and 10 grams of fiber each.

Taz is our Pet of the Day! He is a 2-year-old British Bulldog mix available at the Lexington Humane Society's Main Adoption Center on Old Frankfort Pike. Adopt today!