There is no need for you to avoid this delicious, seasonal fruit. Remember that any fresh fruit contains a lot of minerals and vitamins that are crucial for overall health. But like any other fruit, moderation is the key here. If you want to eat mangoes then you can, as long as it is in moderation.
Some dieticians suggest that being diabetic one should restrain the consumption of mangoes to about 50-60 grams a day. This should be done after the meal and not before. What happens here is that you get the dual benefit of a healthy dessert and your favourite fruit. But it is also suggested that you exercise regularly and remain stress free. Doing so controls your blood sugar levels in check.
Remember that mangoes are a fruit that have higher glycemic index going above 50 and as a result of this, they are able to release much more sugar into your blood levels. Also, mangoes in form of juice, with added sugars or preservatives are a strict no-no. If you want to eat the same, do so in its natural form.
Also, another point of view here is that mangoes also contain some good carbohydrates that that have a direct impact on your blood sugar levels. So irrespective of the source of the carbohydrates, say starch or sugar - carbs in all forms can be a problem for diabetic people. However, in most cases, doctors do not advice you stop eating mangoes. So don’t shy away from this fruit completely - but try to have a smaller portion of the same. If possible eating mangoes post exercising or some activity is suggested - instead of at night. This happens so because your metabolism rate is still up and this way you are able to burn off all that extra energy and sugar.