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There are some web-sites advocating that eating fruits separately to other foods is healthier.

When fruits are eaten alone, your stomach can more easily process all of the nutrients, fibre and the simple sugars contained in the fruit. This is the optimal 'proper way' to benefit from the fruit you eat.

Advocates of food combining also focus upon not including fruit as part of a meal. For example, a common recommendation is to wait at least an hour after consumption of any non-fruit foods before eating a piece of fruit.

They suggest dubious mechanisms - for example, from Mind Body Green:

If you eat fruit close to a meal, especially right after a larger meal and combine with other foods, it's held in the stomach too long along with other foods and will rot and ferment in the gut.

Whatever the mechanism, they claim benefits, such as from WH Foods:

many people do report better overall digestion when they follow this procedure and a large number of healthcare practitioners advocate fruit consumption separate from meals.

Snopes has an article on the subject.. It is is not very helpful, as it only quotes a few dieticians who disagree with the practice (none of whom cite any studies), which is no better than the sites that support it.

What do the studies say? Are there health benefits to eating fruits as a separate meal, rather than consuming the same amount with other foods?

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I think you need to make your question more clear. Fruit combining can mean simply eating fruit at the same time as other fruits, or it can mean following a very prescribed method of choosing those combinations. It doesn't necessarily have anything to do with an empty stomach. What type of "effectiveness" would you like to know if studies have been done for? –  user5582 May 14 '13 at 18:38
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@BlueRaja-DannyPflughoeft Is your question about combining particular fruits together? Or is your question about eating them on an empty stomach. From my reading, I'm convinced these are two separate techniques. –  user5582 May 16 '13 at 20:40
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@BlueRaja-DannyPflughoeft This site that you reference doesn't say that eating fruits on an empty stomach is better. It just lists particular combinations of fruits that go well together, with the exception of melons, which they claim don't combine well with other fruits. –  user5582 Jun 16 '13 at 17:58
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Please provide a reference for people using "fruit combining" to mean eating on an empty stomach. –  user5582 Jun 17 '13 at 5:55
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