What kind of sugar is in grapefruit juice?
NutritionData does not seem to have a breakdown: LINK
I remember getting a copy of this crazy heart diet almost ten years ago that claimed that you should eat bacon, butter and high fat foods in order to lower your cholesterol, which like anything in retrospect had some good and bad advice in it based on the latest information that we now have about saturated fats, sugars, insulin, etc.
I am not craving juice or sugars, but I have started to become really curious about the kinds of sugar in foods. I know on PaNu they seem to vilify fructose and fruit in general and for whatever reason I remembered this fad diet from ten years ago which emphasized saturated fats, but insisted on eating grapefruit juice as a fat burner.
NutrionData says that there are 23grams of carbohydrates, but has no sugar information.
I did some searching, but cannot seem to find a sugar breakdown on grapefruit. Does anyone have more information on grapefruit juice? I'm assuming the claim that it catalyzes fat burning is bunk, but am still curious about carbohydrate content.
In general, citrus fruits are relatively low in fructose compared to, say, watermelon. David is correct about the ratios, but to flesh out the numbers for pink or white grapefruit, total sugar is 6.2%, or 6.2gm per 100gm fruit. Total fructose content is 2.9%, or 2.9gm per 100gm. Remember, sucrose is 1/2 glucose and 1/2 fructose, which makes the total glucose/fructose ratio about 1:1. Juice would be slightly different from whole fruit. Again, numbers are from Cordain, secondarily sourced here (scroll to bottom chart): http://www.reducetriglycerides.com/reader_triglycerides_low_fructose_fruit.htm
Well, you can go use a chart linked to from Dr. Cordain's site which gives a breakdown on the sugar types in the actual fruit itself. The raw fruit will most likely be different from condensed juice, but if you make your juice drinks from fresh fruit it might be close.
Summary: 1 :: 1 :: 3 ratio of glucose, fructose, and sucrose, respectively.
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