Great video on why we get fat. It isn’t the fats, it is the carbs, most specifically processed carbs bread, pasta, cerereals, etc.

From CrossFit.com

World-Class Fitness in 100 words

• Eat meat and vegetables, nuts and seeds, some fruit, little starch and no sugar. Keep intake to levels that will support exercise but not body fat.
• Practice and train major lifts: Deadlifts, clean, squat, presses, clean and jerk, and snatch. Similarly master the basics of gymnastics pull ups, dips, rope climb, push ups, sit ups, presses to handstand, pirouettes, flips, splits and holds. Bike, run, swim, row, etc. hard and fast.
• Five or six days per week mix these elements in as many combinations and patterns as creativity will allow. Routine is the enemy. Keep workouts short and intense.
• Regularly learn and play new sports.