A growing subculture of people are looking to their Paleolithic ancestors for diet tips.

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The caveman lifestyle involves eating a lot of meat, fruit and vegetables and then fasting between meals to approximate the lean times hunter-gatherers faced between hunts.

ABC7 reporter Suzanne Kennedy speaks with several people about the benefits and pitfalls of the caveman, or Paleo, lifestyle. Watch her report tonight at 5 p.m.

The benefits include reducing intake of processed foods and incorporation of exercise programs--some which even simulate.

See a photo gallery of the foods you can and can't eat.

However, the diet "is pretty restrictive in that the idea is you can't have anything that has grains in it. You also can't have legumes or beans. And finally, no dairy products."

One nutritionist warns a person may not be able to meet their vitamin and mineral needs such as calcium if they're leaving out milk, and iron if they're cutting out grain.

"I would worry about people not getting enough carbohydrates," Nutritionist Rebecca Scritchfield said. "When you take out the grains, you're limiting your carb intake and also fiber. If you don't get enough carbs, you could have low blood sugar and that could leave someone feeling cranky or irritable."

Ultimately, it's difficult to tell whether the Paleo diet is any better or worse than other diets in the market.

"We don't have the scientific evidence to show that Paleo is going to make you healthier than balanced eating."

WATCH today at 5 p.m. as Suzanne speaks with people who follow the diet and how it has worked for them.