If you are hurt bad enough to be med boarded, why doesn't that qualify as having a medical issue that hinders weight loss?

You can request a referral to the nutritionist

This will get more attention if you add the actual question to replace "AR600-9 question?".

With lack of exercise the body will store up fat cells, need to watch what you eat, and try to do some exercise.

It's a legitimate question. I steadily gained weight the last few years I was in because past injuries were making daily PT difficult. I did what I could to counter the gain by significantly changing my diet but in the end the injuries were winning. By being recommended to a medical board, the Army is recognizing that your ailments could effect your ability to serve, especially if exceeding the height/weight standard is a symptom of the injury.

You can and should request a nutrition consult. The question is regarding Body Composition and exercise. While exercise is one contributing factor, it is not the major one. Diet is the primary factor. If you are not able to be as active as before your injury/illness that doesn't prevent you from limiting your caloric intake. It also usually doesn't mean you can't do anything. You have to do what you can and be careful with your caloric intake.

I'll be honest, the way you 0brased your question was super confusing. But since you said it's a 600-9 question, here is what I know. Upon being placed I to the Army Body Composition Program, you WILL see a nutritionist, that is not an option. You will also be given a hand out to read about nutrition.
If you have a legitimate medical problem you can not be chaptered while in the program. When entered into to the program you will be counseled by your commander, then is the time to tell them if there is a medical problem that has not been previously resolved and they can involve the PA.
Hope this answered your question.

There is no medical issue that will exempt you from meeting height and weight standards. There are certain medical issues that the provider is allowed to recommend a specific amount of time to be rectified before you are capable of meeting height and weight. For instance, if you have hypothyroidism, you are allowed a certain amount of time until the medication is dialed in to the correct level and you are expected to meet height and weight. In this case, you need the medication in order to make height and weight. If you are injured, you are so capable and physical activity, and reducing caloric intake.
If someone is unable to meet height and weight because of their medical condition, they will be separated under a medical board. The same thing applies if a person is injured so much that they are unable to perform and unable to meet height and weight standards, they will be separated under Medical Board.
Just because someone finds it harder to keep weight off while they are injured, that is not a justification for a medical separation.

Eat more salad