Orange juice is the liquid expressed from the orange citrus fruit. Most of the juice oranges in the U.S. are grown in Florida as opposed to the eating oranges grown in California.
Orange juice is available in a myriad of options from no pulp, to high pulp, low pulp, filtered and so on. While oranges are certainly an excellent food, the juice has its downsides. Oranges have a very high sugar content and are high on the glycemic index scale (50). If you do drink orange juice make your own or go for the high pulp variety.
Frozen orange juice is a convenient alternative to fresh. Typically available in 8 or 16-ounce cans, the concentrate is added to water to produce fresh juice for drinking or for cooking. One 16-ounce can is added to 48-ounces of water and makes a total of 8-cups of orange juice. So what if all you need is a 1/4 cup of orange juice and you don't want to make the whole 8 cups? You can calculate this easily enough because it's a simple ratio of 3-to-1; 3 parts water to one part orange juice. Better yet we do it for you in the chart below.
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A serving size is 1/4 cup concentrate plus 3/4 cup water and is 110 calories. The pure frozen concentrate has no added sugar. Beware of products referred to as "Drink" for example, like "Orange Drink." These products frequently add sugar to the product.