Of course, it is. The science does not get any better. God set it up that way. If you eat right, get the proper amount of sleep and exercise, and keep [certain things] in balance --- you are healthy. Otherwise, you are not. Do it God's way and there is no problem. What you eat and drink can have far more beneficial effect on your health than anything a doctor may prescribe for you. And, this is a long-time proven fact. (Not to mention, it is what we learn from the Bible.)
Concerned about finding a cure for cancer? Don't be. We already have one. It is in your body and mine (and everyone else) - since birth (or possibly before)! God put it there. It is part of our immune system. Only, the [evil] powers-that-be don't want you to know about it. And, it is highly unlikely that you will ever hear about it on TV.
(There is a lot more I would love to tell you - but, quite frankly, I don't feel like typing it all out right now.)
What you eat and drink - and, how it affects your health by virtue of your natural body chemistry - is absolutely most certainly 'science'.
Believe it!