Continue exercising as it has many benefits besides losing weight. Cycling is good for toning up thigh muscles. As far as diet is concerned,an inadequate diet is responsible for protein deficiency leading to hair fall. Weight loss diets when not planned properly, are grossly deficient in nutrients like proteins, vitamins and minerals due to severe restrictions or limited intake of food. You need to eat sufficient calories to prevent protein from breaking down resulting in protein deficiency. You can limit your intake of fats/oil to 3 tsp or 15 gm a day but make sure you eat adequate carbohydrates to prevent protein breakdown to meet energy needs. You may also require a multivitamin and mineral tablet/capsule to ensure you do not suffer from any micronutrient deficiencies. The amount of calories you are taking are too less. You must increase your intake of food and include more protein rich foods like paneer, curd and dals (cooked or sprouted). If non-vegetarian, you can safely have boiled eggwhites or chicken and fish (steamed/roasted or as curry with less oil.) Include a variety of fruits (fresh and seasonal) and vegetables like leafy greens (spinach, amaranth and fenugreek) along with salads like cucumbers, tomatoes, onions, lettuce, cabbage, carrots to ensure a diet rich in vitamins and minerals. Stretch marks develop when you either lose weight too quickly or gain weight quickly. It is a myth that by draining excess water from rice, starch is removed. It is not a good practice and you will only lose B vitamins in this process, not starch which is there in the grain itself! So, do not drain excess water from rice while boiling. Hope this answers your query satisfactorily.