The first thing you need to do is not use the Basal Metabolic Rate or better known as the BMR when calculating your caloric intake. This can totally destroy all of your work while trying to lose that weight. It is of particular importance to those with spinal cord injuries and disabilities that cause muscle atrophy.
First let me give you a short definition of the BMR. This is the formula designed for men to use: BMR = 66 + (6.23 x weight in pounds) + (12.7 x height in inches) - (6.8 x age in year).
You enter your weight, height, and age into the formula to find out how many calories your body burns while at rest. Did you notice the 66 figure in the formula? That number represents the standard male, which someone with atrophied muscles will most definitely not be. The muscles that typical males have will no longer be there to make the 66 figure in the BMR formula credible.
Once you've calculated your BMR you can then go to the Harris Benedict Equation and multiply your activity level by your rate and get your caloric maintenance level. This is the number of calories you will need to maintain your weight. This sounds good and everybody uses it so it must be a good tool in your weight loss efforts. Well almost everybody uses it except for the very over weight and bodybuilders with a high percentage of lean muscle. They have found out that this is a bad measure and now you know that it is wrong for someone with a disability too.
For instance my BMR may say I need 2100 calories a day to maintain my body weight. Then to lose a pound a week I'd need to have a negative 500 calorie intake a day from my BMR of 2100 calories. That would leave me with 1600 calories a day to get me to my weight loss goal. Wrong, because the 2100 is not a level that may cause me to gain weight. My maintenance calorie intake level is closer to 1700 calories a day. So I do not lose any or so little to the point that you just give up because you think it's you that is the problem. It took a great deal of time and tweaking my caloric intake levels to find my true maintenance level.
This is what I did to lose my weight. I calculated my BMR as anybody else would but I decreased the body weight amount I put in the calculator by approximately 30%. Then I subtracted my 500 calories from that amount to come up with a calorie count that would help me reach my weight loss goal. That 30% ended up being the amount of muscle mass I loss due to atrophy of my legs from my spinal cord injury.
It is possible to lose the weight and even use the BMR just be sure you adjust it to your body whether disabled or not.