Turtles can generally eat grapefruit. In many cases, feeding them grapefruit can be a healthy addition to their diet. They can especially benefit from eating the rind, because it’s a rich source of dietary fiber and can help alleviate constipation in turtles.
Feeding your pet turtle grapefruit can also make him feel full so that he won’t beg for more food at mealtime or snack between meals. It can also keep his digestive system running smoothly and can prevent future problems with obesity.
However, some turtles are sensitive to citrus fruits and may experience negative side effects when they consume them, including diarrhea and vomiting. While these symptoms don’t necessarily mean that your turtle is lactose intolerant (most likely) or can’t stomach grapefruit, it can be a good idea to monitor his digestive health and food intake when he eats grapefruit.
When you feed your turtle grapefruit, make sure that they’re ripe and fresh. They should have a sweet aroma and should be free from mold or blemishes. You can also prepare them for him as part of his meal — cut them in half with a serrated knife before feeding so that he can easily bite into the fruit or swallow down pieces whole if necessary. As long as he’s not sensitive to citrus fruits, there shouldn’t be any harm in eating grapefruit as one ingredient in his diet.

I have a big soft spot for turtles. I grew up near a pond that was full of snapping turtles. Now and then I’d see them crawling across our front yard, which was always exciting.
Now I write about turtles for this website as a fun side hobby. Glad you stopped by!