A.G.
My husband started a GF diet (along with no dairy, limited sugar, and no meat) last August because he was having a lot of trouble with gas. He had already seen a specialist, and had not had any luck figuring out what the problem was.
After being on the diet for several months, he did see some improvement, and his cholesterol improved dramatically. All of us in the house were/are on the diet when eating at home simply because we didn't want to cook a bunch of different meals. When we go out, we don't stick to it, although my husband does.
Now he still sticks with all parts of the diet except that he's added back chicken. He's still GF for the most part, and is dairy free and has very little sugar. The rest of the family does the same, but we have dairy. We all feel healthier. I think limiting sugar and taking out red meat has made the biggest difference.