Depends what fruit and depends in what amount.

You can safely eat 200 grams of tomatoes as the sugar and calorie amount is pretty low but it will make you feel satiated.

Meanwhile 100 grams of banana will have 5 times the sugar and calories of tomatoes (for 100g) but still is pretty fine if you restrict yourself at that 1 small banana.

200 grams of an apple is also pretty safe and is a nice snack.