My partner and I have both experienced a lot of improvement after changing our diets. We were vegan for a while, and the veggie part of it was good, but both of us are doing much better now that we are following a diet that is more paleo or GAPS style.
Getting rid of wheat was a huge part of it. It really isn't a healthy thing anymore, due to a combination of breeding and industrial processing. I think more ancient forms of wheat, sprouted or fermented in a traditional way, would probably be fine for many people, but the modern wheat strains and their processed forms are bad news.
I've always been skinny, sometimes excessively so. In terms of feeling good in my body, this diet has been the best so far. Lots of veggies and some healthy meats.
My partner is bigger in general. She was skinniest when she was raw vegan for a summer, but it wasn't a balanced state. A diet low in carbohydrates and high in healthy fats has helped her to improve some long term health conditions including cracking aching joints, muscle weakness, and sound sensitivities.
My stepdad actually lost like 98 pounds when he went vegan, but found it easier to maintain his big dude muscles. I think this is partly because before that, he pretty much refused to touch vegetables.
I think no matter who you are, more veggies is probably a good thing. I think that beyond that, everyone has individual dietary needs and has their own ideal weight. I think that health goals should be based on overall wellbeing, not just appearance.
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