Others issues – like low insulin sensitivity or a generally slow metabolism – might be effectively managed with more complex diet changes. Switching to a low carb diet might be able to increase insulin sensitivity for example, whereas certain nutrients can support your metabolism in other ways. Whether or not these sorts of diets have merit is a matter of intense discussion and internet flame wars but either way, it is beyond the reach of most fitness trackers (though macro tracking is possible through MyFitnessPal to an extent…). Try lowering your calories to start with and if you don’t see the results you’re expecting, see your doctor and consider other diets.
Low blood glucose (hypoglycemia): Hypoglycemia may occur if too much insulin is used, if meals are missed, or if you exercise more than usual. Symptoms of mild to moderate hypoglycemia may occur suddenly and can include cold sweat, nervousness or shakiness, fast heartbeat, headache, hunger, confusion, lightheadedness, weakness, and numbness or tingling of the tongue, lips, or fingers. Mild to moderate hypoglycemia may be treated by eating foods or drinks that contain sugar. People taking insulin should always carry a quick source of sugar, such as hard candies, glucose tablets, juice, or regular soft drinks (not diet soft drinks).