You don't have to follow a particular diet or exercise regimen to be a spiritual person.
In fact, judging or harassing others over their health choices is not a spiritual act.
It is good to take care of and respect your body so that you will feel good and be able to fully live all aspects of your life.
No single diet or exercise program fits all. You need to find one that works for your body and is reasonable for your lifestyle.
Your Angels will talk to you no matter what you had for dinner, but if you are sleeping off an unhealthy feast, you might not have the energy to talk to them.
As you grow spiritually, take care of your physical form as well. Just as a church must be cleaned an kept up, your physical temple must be maintained to give your soul the home it deserves.