Despite common misconceptions, diabetics can eat mashed potatoes. However, moderation is especially important because of the carbohydrates in potatoes and related foods. It is best to have no more than 1/4 of a plate filled with starchy foods such as potatoes, according to CNN.
It is also important to consider other starchy foods eaten in combination with mashed potatoes. If someone fills 1/4 of the plate with pastas, breads or other starchy foods, mashed potatoes could cause problems because of excessive starches, reports CNN. One way to help ensure there are no negative repercussions, especially after a large meal, is to follow it up with a walk, according to The New York Times.