The so-called "paleo diet" may be the longest-standing diet ever, and some say the trend even dates back to the days of the caveman.
Followers of the diet can eat meats, fish, fruits, vegetables, nuts and seeds, but grains, legumes and dairy is not allowed.
Rebecca Brown spends most days at the gym teaching crossfit classes and says getting results takes the right combination of exercise and diet.
"A workout might take you five minutes, but it's the longest five minutes of your life. Pretty quickly, you figure out that the way you're eating affects things," Brown said.
That's what happened to her. A few years ago, Brown gave up smoking and took up crossfit. But even after spending hours in the gym, she wasn't getting all the results she wanted.
Then, she heard about the paleo diet - essentially cutting out grains, dairy and legumes.
She gave it a try and said the results started to show.
Now, two years later, she's keeping with the diet.
"It becomes habit. I have my cheat meals. Mainly, I don't bring anything into my house that's not paleo," she said.
Registered dietician Brittany Siler says there are differing opinions as to how healthy the diet really is.
"Some studies have shown it is below government suggestions," she said. "Any time you're cutting out a major food group, you need to be cautious that you are not going to be getting adequate nutrition."
One suggestion for people on the paleo diet is to take supplements for things like calcium. But Brown contends her diet now has more nutrients than it did before the switch.
"I eat so many greens that I get way more calcium than I was getting before when I was eating dairy," she said.
Saturday, July 26 2014 1:38 AM EDT2014-07-26 05:38:59 GMT
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