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#10 – The Ornish Diet

Dr. Dean Ornish's diet plan is based on his $11 book Eat More, Weigh Less. It has been rated as the best diet for heart diseases and is low in protein. You don't have to spend money on pre-packaged food or supplements with this plan, and just have to buy healthy foods including fruits and vegetables. The Ornish Diet makes about $16 million per year.

#9 – The Zone Diet

The Zone Diet became popular after Barry Sears wrote a book about it. It is similar to the Paleolithic Diet and is based on the idea that humans have evolved and must adjust their diets accordingly. If a dieter orders all of their meals from The Zone, they will end up spending about $200 per week. The Zone Diet makes about $20 million a year.

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#8 – The Atkins Diet

The Atkins Diet has been very popular and focuses on low carbs and high protein intake. It is expected that a dieter will spend about $100 a week for a combination of supplements, shakes, and recipes. The Atkins Diet brings in about $20 million a year.

#7 – eDiet.com

This online dieting service started up in 1997 and offers dieters professional advice and nutrition plans. This diet plan is expensive and will set you back about $170 per week. The good thing is that the food is all inclusive and you won't have to supplement it by going to the grocery store. eDiet.com makes about $30 million per year.

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#6 – The Slim Fast Diet

With The Slim Fast Diet we start really jumping up there in terms of money makers. Slim Fast sells shakes, snacks, bars, and packaged meals all across the world. Customers pay $77 per week to receive food, advice, and personalized plans. The Slim Fast Diet brings in about $77 million per year.

#5 – The South Beach Diet

South Beach preaches high protein and low calorie options. This diet will set you back about $315 dollars a month, which certainly is not cheap. The South Beach Diet makes about $170 million a year.

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#4 – The Jenny Craig Diet

Jenny Craig has been around since 1983 and focuses on the relationships between the body, the mind, and food. Jenny's diet will cost you around $550 every month if you follow it to a T. The Jenny Craig Diet makes about $343 million per year.

#3 – The Nutrisystem Diet

Nutrisystem is supposed to be easy to follow and sells pre-packaged meals on their website which can be delivered straight to your home. This diet has even been described as fast food for weight loss and costs a dieter about $113 a week. The Nutrisystem Diet brings in about $396 million each year.

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#2 – Weight Watchers

Weight Watchers is one of the oldest and most popular diet programs around. The company operates in 30 countries and costs dieters just short of $400 a month for mostly consuming fresh products. Weight Watchers makes about $400 million per year.

#1 – The Dukan Diet

While it may not be as much of a household name, the Dukan Diet is the top money earner amongst weight loss plans. It is also known as the "princess diet" and took off in 2000 when French doctor Pierra Dukan published his book. There is even a list of 100 foods which are allowed on the diet, which excludes entire groups of nutrients. Celebrities like Jennifer Lopez have endorsed the Dukan Diet, which costs dieters about $10 to $15 a day for high protein foods. The Dukan Diet has earned about $660 million.