Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain sweet taste in mouth can occur due to common causes like Diabetes,throat infection, sinusitis,acid reflux, infection or inflammation of olfactory nerve, while certain serious conditions like Stroke can also be a cause.. In case if you are not taking carbohydrates then it can also be due to ketoacidosis due to excess ketones formation.. One information that I would like to give you is that weight loss can be done by taking a low carbohydrate diet but completely avoiding carbs can be harmful for body.. So better get a proper diet chart prepared by a registered Dieticion and Nutritionist.. If low carb diet is not the cause then it should be taken care of and you should consult a Medicine expert and get evaluated and he can do a thorough clinical examination and investigations like blood sugar levels, complete blood picture, throat swab culture, sinus x rays and also MRI scan can help in diagnosis and treatment can be done according to the cause diagnosed.. Treatment of the underlying illness can relieve the symptoms.. As of now you can maintain a proper oral hygiene. Gargle with warm saline solution.. Do antiseptic mouthwash gargles.. Drink plenty of water.. Take a nutritious diet, take multivitamin supplements and chew more of raw fruits and salads.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.