I have always been told by healthcare professionals that you need to consume 12 calories each day per pound of body weight to maintain your weight. Less than 12 you start to lose and above that amount you start to gain. What if you are older and completely sedentary? Is it possible that your metabolism slows to the point that you only need 8 or 9 calories per pound to maintain weight? Any input will be greatly appreciated.

That's a general number, but it doesn't apply to everyone. Yes, if you're older and sedentary, you may need fewer calories. Experiment. Try a certain calorie count for a month or so and monitor your weight.

Also, if you regularly exercise, that will make a difference. I'm 46 and short (5 ft 3), but I maintain my weight (approx. 140) on about 2100 a day. I exercise a lot, though (walk 4 1/2 miles & Crossfit about 30 min, 6 days a week).

Calorie needs are different for everyone. They should be based off of age, body type, and activity level. There are many calorie calculators available online that will give you a good idea of how many calories you should be consuming to either loose, maintain, or gain weight.

So here is what you should eat; protein (make sure you eat enough for your weight), fiber, veggies, beans, fruits, and drink plenty of water. Stop worrying about your calorie intake and eat what your body needs; healthy food. Good food is the only thing that is going to keep you healthy. As long as you get what your body needs, you will be fine. Your body will tell you when you are satisfied with eating and it will tell you when it's hungry, listen to it.

My doctor believes in the existance of "fat genes" and is part of the research into the cytokines or whatever that stuff is called.. So he gives me 9 calories per pound since my family history of obesity is IMMENSE (pardon the pun).

But yes, it matters your age, your gender and stuff.