Did you know that Greys Anatomy star Katherine Heigl wanted to be super skinny and look like Nicole Richie?

The 30-year-old actress, who has just recently adopted a 10-month-old Korean baby with husband singer Josh Kelley, hates dieting because she loves food too much and describes it as her “obsession”.

In 2007, the star was, however, on celeb trainer Harley Pasternak’s 5 Factor Diet, while her 5-day workout of 25-50 minutes of cardio and circuit training helped get her in shape for Knocked Up.

“My own insecurity makes me want to look like Nicole Richie,” she told Now magazine recently. “But I’m 5ft 9ins, and have substantial breasts, hips and everything else, so it’s never going to happen.

Instead, the new mother concentrates on being a good role model for her young viewers.

“What stops me is that I want young girls to look at me and think: ‘That’s healthy, that’s what I want – she’s on television and she looks like me’.”

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Katherine Heigl has slimmed down while on the hit series Grey’s Anatomy with the help of celeb trainer Harley Pasternak and his 5 Factor Diet Plan. Katherine’s lunchtime workouts include 25- 50 minute sessions that begin and end with cardio and mix arm, leg and ab moves in between. Her 5 Factor diet plan consists of 5 small meals a day that contain:

1. Lean protein such as turkey
2. Healthy carbs including fruit, veggies and whole grains
3. 5-10 grams of fiber (such as 1 cup of berries or half a cup of cooked veggies)
4. Healthy fats (found in salmon or nuts)
5. Water of tea

Here’s a peek at Katherine’s 5 Factor Diet Plan courtesy of Life and Style magazine:

Breakfast – French toast 5 factor style. In a nonstick skillet, heat 2 pieces of whole-grain bread dipped in egg whites. Top with 1/8 cup of nonfat ricotta and cinnamon. Or try 1 cup of Kashi GoLean in 1 cup of nonfat milk.

Snack – Berry Smoothie. Blend a cup of berries with 2 cups of nonfat milk. Add crushed ice and half a scoop of whey or soy portein (makes 2 smoothies). Or try a slice of pear with 2/3 cup of cottage cheese.

Lunch – Katherine’s favorite is a tortilla pizza. Layer a nonflour tortilla with tomato sauce, Roma tomatoes, turkey, pepperoni, basil, and nonfat mozzarella. Warm up in a toaster oven. Another option is tossing grilled shrimp, spinach and feta cheese into a greek salad.

Snack – Celery and carrot sticks in hummus, or in a spinach dip made from nonfat sour cream and nonfat mozzarella. Or try a slice of whole grain toast topped with 1 cup of low-fat berry yogurt.

Dinner – Marinated sea bass over a cup of brown rice or edamame or herb crusted salmon on a bed of lentils. 5 factor version of spaghetti and meatballs is spagehetti squash with ground turkey breast.

Celebrity Diet Doctor Weigh In…
The “5″ in 5 factor is little on the gimmicky side.  Otherwise it’s a sensible plan.  Up the fruits and veggies and you’ll lose even more weight, but I’m not going to argue with the results.  Katherine looks stunning.

A-list celeb trainer, Henry Pasternak, got Katherine Heigl in the best shape of her life for a revealing love scene in her new surprise hit Knocked Up. Pasternak, who has toned up Halle Berry, Jessica Simpson and Sheryl Crow, tells People magazine his workout for Katherine consisted of cardio and circuit training 25- 50 minutes, 5 times a week for 6 weeks prior to filming. On set, she continued working out by jumping rope and lifting dumbbells.

Katherine Heigl’s Diet
She ate Pasternak’s 5-Factor diet of 5 high-protein, 5 high fiber meals a day, that also included one weekly cheat day. (Sample 5-Factor menu: French toast with ricotta cheexe, Tex Mex chicken salad and sea bass).

Follow up
One year after filming Knocked Up, she is still working out regularly. She tells People “I used to have back pain. Suddenly, my body is supporting itself the way it’s supposed to.” She gushes, “My god, I can’t believe this is my body!” How did this happen?”

Her keys to success include:

• Similar to Janet Jackson and Jessica Alba, she uses a moderately high-protein diet that helps with weight loss and weight maintenance.
• She continues to work-out regularly which is critical to successful weight maintenance.