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It is total bunk. The acidity of the stomach juices ( chyme ) is very high (ph 2) eating citrus or tomato will not change the acidity of chyme or effect the digestion of carbs. More importantly, citrus fruits and juices contain carbohydrates in the form of sugars. It is nearly impossible to separate carbohydrates, fat and proteins because many foods contain all three.

Here is an article that discusses the history of how the idea arose in the early 1900 and why the notion is nonsense.

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