You can work and strive in the flesh to walk in physical health, or you can rest in Christ.
Take My yoke upon you and learn from Me, for I am gentle and lowly in heart, and you will find rest for your souls. For My yoke is easy and My burden is light.
There is a difference between eating to obey the Lord, or working, in the flesh, to keep your body healthy.
Health and healing are part of the work that Christ did on the cross. It has been done. Are you going to rest in that work, or do your own working?
We need to seek His will for our lives, in all areas, including our diets.
Take your babysteps, the steps that the Lord leads you in. He will give you the ability to follow through. When we come up with our own plans is when it's hard and we too often fail.
Do you need some rest?