by 
The Curious Bag
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Citric acid is present in variable amounts and concentrations among many fruits. This organic, soluble acid has many healing properties but should be consumed in moderation.
Uses
Aside from being a natural diuretic, it contains high levels of antioxidants and has the ability to aid in the body's metabolism.
Identification
In comparison to other food groups included in the USDA's New Food Pyramid, the fruit group has the largest amount of foods containing citric acid.
Types
Of all the fruits, lemons and limes have the highest concentration of citric acid per weight (up to 8 percent) followed by other citrus fruits like grapefruit, oranges and tangerines. Most berries also contain citric acid (with the exception of blueberries). Pineapple, tamarind, tomatoes and fruit preserves follow are close behind on the citric acid index.
Fun Fact
Citric acid is also contained naturally in foods like vegetables, wine, cheese and some bread. It is commonly used as a food additive in soft drinks and in fruit preserves.
Warning
Although beneficial to your health in moderation, some have a sensitivity to citric acid. Common complaints include heartburn and gastronomical upset. Some people are also allergic to citric acid.
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