Which fruits are relatively low in carbs?

You can also eat up to one cup of berries each day. Have high-sugar citrus
fruits only occasionally—grapefruit is lowest—and bananas only once in a
while. Avoid fruit juices, which provide huge doses of sugar (a splash to
flavor seltzer is okay). Choose whole, fiber-rich fruit instead.  As a
general rule, limit your fruit servings to two or a maximum of three a day.
After you have tested your tolerance to fruit sugar and are still able to
gradually lose or maintain your weight, you can try the higher glycemic fruits 
such as pears, mangos, melons, pineapple and so forth.

Eating fruit with nuts will slow down the release of the sugars into the
blood stream. Eating fruit with animal protein may cause flatulence in some
individuals.

Most nutritional recommendations lump together fruits and vegetables. While
there is no question that fruits are loaded with phytonutrients and fiber,
you cannot ignore the impact they have on blood sugar and insulin levels.
Ounce for ounce, veggies—and the greener the better—can offer more of the
same benefits with less of a blood sugar spike. Research has shown that a
diet that includes sufficient vegetables can reduce the risk of colon and
rectal cancer.