"This isn't going to be an excuse to eat French fries all day and watch TV but is a way to augment your healthy lifestyle and give you the ultimate benefits of perfect health which your body is capable of, " Professor Sinclair told the BBC.

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"It's hard to sit there and watch people eat McDonald's french fries and not go buy your own, " says Ted Lezotte, a McDonald's franchisee in northern Michigan who owns four restaurants.

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He wants distributors to pitch ShapeWorks as a cheap and healthy meal replacement for people who eat too many cheeseburgers and french fries.

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Secondly, you have to know the right tricks to convince your little one (who's sometimes being a little monster) to stop having a fit and eat the apples instead of the French fries.

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Dearly. (Laughter.) Deeply. (Laughter.) I have a good relationship with French fries and I would eat them every single day if I could.

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If you eat fast food once a week, a small switch from French fries to apple fries could save your children almost three pounds of weight a year.

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