The naturally occurring sugar content in various fruits ranges from 28 grams per cup for bananas to 1.4 grams per whole lemon. Well+Good recommends eating fruits with less sugar, such as strawberries (7 grams per cup), apples (11 grams per cup) and cantaloupe (13 grams per cup) to avoid experiencing blood sugar spikes.
According to Jillian Michaels, fruits containing high levels of sugar, besides bananas, include watermelon, grapes, peaches, oranges, plums, cherries and pears. All of these fruits contain between 13 to 19 grams of sugar per serving. A medium-sized tomato contains about 3.2 grams of sugar, although they have a reputation for being much sweeter due to the high amounts of sugar that are added to many tomato-based products, including catsup and spaghetti sauces. Limes and avocados do not contain sugar.
The glycemic index, or GI, is a measurement that helps determine the affect that foods with carbohydrates can have on a person's blood glucose levels. According to The World's Healthiest Foods, low-GI diets can decrease a person's risk of developing a host of diseases, including type 2 diabetes, chronic kidney disease and cardiovascular disease. Fruits with low GI levels include apples, blueberries and cranberries. Fruits with high GI levels include pineapple, apricots and figs.