I am 54 years old and 223 pounds. I am taking Phentermine(37.5) now for a month and eating about 1400 calories a day as part of a no more than 35 grams of carbs diet. I only eat fresh low carb vegetables and lean meats; no sugar, no sodas, no junk food, no alcohol, no smoking; and walking 1 hour / 3 times a week. I only lost 5 pounds in 30 days. This is very depressing. I am on Thyroid medication for an under-active thyroid and am within range. What else can I do?