When I called celebrity fitness trainer Kathy Kaehler for our interview, she sounded a little out of breath. “I was training Julia Roberts this morning,” she said, “so I don’t get a lot of lead time on my schedule.”

Yes, it was just another day in the life for Kathy – one morning it’s Julia, the next it’s Kim Kardashian, Jennifer Aniston or Karina Smirnoff. But, no matter who she’s training, her fitness and nutrition tips remain the same, and we were lucky enough to have her share her top six with us:

Nutrition

1. Prep Your Meals Beforehand

When researching for her new book and TV series, Sunday Set-Up, a revolutionary way to get your meals ready for the entire week, Kathy toured a number of celeb kitchens. She found that many of her clients did very little to make a meal. Rather, they’d press a button on a microwave, or eat a pre-packaged meal because they were quick and easy (sound familiar?).

To resolve this problem and eat more healthy, organic foods, Kathy suggests taking two hours ahead of time early in the week to prep your ingredients and vegetables. “It gives you a sense of ownership with your food,” she says. “You know where it’s coming from, you picked it out, you’re washing it, chopping it, you’re putting it in containers that are visible to see throughout the week. Ultimately, it gives you a better chance to make a good choice.”

2. Know Where Your Food Comes Fron

Because of Kathy, Julia Roberts has chickens in her backyard, and Kim Kardashian and Kris Jenner seriously considered the idea as well. With chickens nearby, you’ll get fresh eggs—and Kathy says that’s vital. But she realizes that’s not a possibility for most people.

Read A Dietitian’s Advice: Getting Ready for the Eating Season

She suggests shopping at a local farmer’s market or taking that extra step by asking your food provider, ‘Where are these eggs from? Where do the chickens live? Are they organically fed? Are you buying eggs with hormones and steroids?’ There are a lot of things that you can ask as a consumer – don’t rely on government regulations to take care of you.”