Swedish researchers found that rye eaters were more full 8 hours after breakfast than wheat-bread eaters, thanks to rye's high fiber content and minimal effect on blood sugar.

Experts believe the high fruit sugar, or fructose, content of juice causes uric acid - a waste product in the blood - to leach into joints, causing them to become swollen and very painful.

In fact, its high water content gives it a low glycemic load, meaning it does not raise blood sugar levels quickly in amounts typically eaten.