I think that each person must find through experimentation what diet works best for them; as we are all different in what we digest easily, as well as what is do-able given our different life-styles and our unique challenges
My diet is a low fat (don't digest it very well), ovo-lacto vegetarian one; but is 80-90% vegetable based. I consume very small amounts of egg and dairy (yogurt, coffee cream, cheese only); and grain is restricted to small amounts of rice and whole oats.
I do use a bit of Xyla, molasses or honey for sweetening hot beverages but other than that don't consume any other forms of sugar; including fruit juices and preserves. Some fruit is taken, but this too is rather restricted as too much tends to upset my digestive system.
While this sounds restrictive and boring, it isn't.
Although I generally don't eat for entertainment, when I'm looking for a treat, I can usually find something that satisfies the odd craving from within this diet. There are so many different vegetables and ways to prepare them in combination to satisfy both the palate and nutritional requirements.
For snacks, I make my own vegetable & seed crackers on a dehydrator...but must admit that occasionally I give in to popcorn, Cheezies or a bit of chocolate
Protein principally comes from quinoa (which is a seed) and legumes, but is rounded out with eggs and dairy.
Fats and oils principally come in the form of coconut oil, but I also use peanut, sesame, pumpkin and sunflower seeds and their oils in smaller amounts.
I've been on this diet for decades and it works to control the symptoms of regional enteritis and also seems to keep the symptoms of general inflammation in check.
With love, Erika