WE all know the type.

That razor-thin suit storming down Park Avenue in a pencil skirt, waving a cab with her Hermes bag, while typing into her BlackBerry and conducting a conversation with her husband and power client simultaneously, thanks to a Motorola ear piece robotically attached to her morning-blown, Frederic Fekkaicoifed hair.

We shrug this off as a superhuman. She probably doesn’t eat, we think. She probably has a nutritionist, one-on-one trainer and personal chef, all waiting to cater to her every need. That will never be me.

Thinking we could never afford this lifestyle, we go home and guiltily gorge on Ruffles potato chips and onion dip.

Drop the chips, says Park Avenue diet doctor Jana Klauer. You might not be able to afford to the Hermes, but you can fit into the pencil skirt, she argues in her book, “How the Rich Get Thin.”

In only three to five days, Klauer promises that you will drop a dress size.

“I suggest this plan for my Park Avenue socialite patients who need to fit into a body-revealing dress,” she writes.

Klauer teaches the average person everything a personal chef and trainer for the wealthy would know, from analyzing the contents of a food label to deciphering the mercury levels in fish and shellfish.

“The people I see in my practice are the movers and shakers in this city, and they are accomplished individuals who live on Park Avenue,” she says.

“There is a unique personality mindset that I think is characteristic of them. They are goal-oriented and motivated. They have a plan for every single area of their life, but like many of us they struggle with their weight. The idea of having a plan is a familiar concept for them. When I give them a plan, it gets done.”

This plan involves eliminating all processed food, alcohol and carbohydrates and substituting it with protein and calcium. We’re talking low-fat cheese, low-fat yogurt, cottage cheese and omega-3 fatty acids, like salmon.

“One should choose what they eat very carefully,” Klauer says. “Just as you choose things to read and don’t pick up any book off the bookshelf. When it comes to a diet, people think, ‘oh, I’ll just get a little of this and that.’ Rather than thinking it is a responsibility to maintain it.”

There are no quick fixes either. As with any diet, you must be willing to change your entire lifestyle and eating habits, work out every day, and most importantly, stick to the plan.

“If you follow it, you will lose weight,” Klauer promises. “You will feel so much better, you’ll look so much better and you’ll have more vitality.”

If you’re ready to take on the challenge, you can start the diet today. We’ve highlighted all the major points in the book so you don’t have to pay thousands of dollars for a private appointment.

You can also share in your pain with Post editor Katherine Pushkar, who will be following the diet this week.

“It’s beginning the New Year in a very healthful manner,” Klauer says. “What one should do is think of this as taking control of their life and their health.”

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Menu for Day 1 of the Social-Lite Diet

Lunch

1 (4-ounce) can of tuna or salmon, drained, with lemon and pepper. One of the best is Tonno tuna, which is packed in olive oil and is a solid light tuna, not white. (White tuna is higher in mercury than the light). It has 196 calories per 3-ounce can; draining it reduces the calorie count to 150.

A large glass of water

Afternoon snack

8 ounces of low-fat calcium-enriched cottage cheese with ½ cup of raw cauliflower or broccoli spears

Several glasses of water over the course of the afternoon

Dinner

2 cups of salad greens with 1 tablespoon of Lime Shoyu Dressing

The dressing is made from: 1/3 cup fresh lime juice

1/4 cup extra-virgin olive oil

2 tablespoons low-sodium soy sauce

2 tablespoons Dijon mustard

1. Mix all ingredients in a small jar and shake well

2. Use immediately or refrigerate for up to 5 days.

3. Bring to room temperature and shake well before using.

4 ounces of broiled or grilled fish or shellfish (may be brushed lightly with olive oil). Shellfish could be shrimp, king crabmeat, sea or bay scallops, and even lobster.

A ½ cup serving of broccoli, spinach, green beans, or asparagus. Vegetables should be steamed and topped with lemon juice only.

A large glass of water

Midnight snack:

8 ounces of low-fat yogurt

Two calcium citrate with vitamin D supplements (600 mg)

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COMING TOMORROW: Your complete workout guide and Day 2 menu

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