I have gained weight for no reason about 12 lbs. over the 18 months. could this mean something is going wrong healthwise? all blood work is normal. calorie intake still is and has always been around 1200-1500.

Dr : Dr lin provided a good response. You are only taking in 1, 200 to 1, 500 calories per day. If your caloric intake is too low, your metabolic rate could drop. Low carnitine and vitamin d can also impact weight gain.

There's : There's normal, and then there's normal. Just b/c all your blood work is normal is the same as saying you passed your classes with a grade between d- and a. If you're used to straight a's, then even a b+ is going to look bad. Likewise, normal TSH (thyroid test) runs 0.45-4.5miu/l - this range will vary slightly from lab to lab. Numbers above the upper limit are described as hypothyroidism and associated with weight gain. But let's say that your TSH is typically 0.5-0.6miu/l and for the last year & half are running 4.0-4.4miu/l. Your family physician would be absolutely correct in stating that you're normal b/c your results are normal and within the reference range. However, you might not feel so normal. I'm using TSH as my example since I have no idea what tests were run but an underactive thyroid is typically associated with weight gain. Don't forget that calories in are only half the issue with weight gain. You also have to ask yourself about your physical activity over this same period of time. Has it decreased? And even if your exercise level hasn't changed, 300 extra calories a day (the difference btwn your guesstimates) will add up to 2, 100 calories/wk and you only need 3, 500 calories to gain a pound. Just something to mull over. Good luck!