Keeping up with the eating habits of our cave-dwelling ancestors can be tough. Luckily someone has slapped together a handy flowchart for you to reference if you've hopped on the latest diet-craze bandwagon, the Paleo diet.

Based on the idea that our hunter-gatherer ancestors didn't suffer from the pains of obesity, cancer, gout and other modern woes, the diet prohibits anything that didn't make up the human diet prior to the agricultural revolution 10,000 years ago. That cuts out dairy, grains, sugars and legumes, as well as all delicious processed foods.