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With her own line of cosmetics, knows skincare — and knows that a healthy glow starts with what you .

“For me, it’s all about feeling good,” the actress, 31, tells PEOPLE of her diet. “I have a makeup line, , and yes it’s easy to put makeup on and go out, but true confidence comes from within.”

“Drinking plenty of water and sleep are my biggest beauty tips. Treat your body how you treat your skin and you will always feel good!”

Tisdale says she just changed up her diet to help her .

“I recently found out what my food sensitivities are, so I had to cut dairy out and certain other foods that weren’t good for me,” she says. “Also, as much as I love carbs I cut them down a lot. I allow myself to have them once a week.”

Check out Tisdale’s  below, and for  and workouts, pick up a copy of PEOPLE, on stands now.


Eight glasses of water


Protein shake made with dairy-free chocolate protein powder, almond milk and blueberries


Hard-boiled egg



Salad with chicken, carrots, avocado, celery, lemon juice and vinegar


Four slices of peppered salami

½ cup of strawberries


Steak with zucchini, onion and mushrooms

Total Calories:


The Verdict:

“Ashley has a super-clean diet and does a great job of eating lots of fruits, vegetables and no junk food,” says Chicago-based dietitian Dawn Jackson Blatner. She praises Tisdale’s snacks in particular, which include produce and a protein: “the perfect combination to bridge one meal to the next without getting too hungry.” And Blatner suggest testing out a few “clean, whole-grain carbs” like brown rice, quinoa and sprouted grains that are good for people with food sensitivities because they’re easy to digest. “Getting them in early in the day is something to consider to keep energy levels up on busy, active days,” she says.