Well, I am one who gained weight at first when going vegan, and I still struggle with my weight after 10 years of it. I am NOT the french fry and soda pop kind. We eat a VERY whole foods, high raw vegan diet (sometimes all raw, for months at a time). Prior to this I ate a pretty standard diet and only gained weight the year before we went vegan due to lots of fast food and then pregnancy. However, I did go vegan when I was 22 so probably if I'd continued eating a standard diet I'd have eventually started gaining weight once I lost the advantage of my youth. ;)
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When we first went vegan we ate the McDougall way which is very low fat and little-to-no flours/refined grains; we ate that way for 2+ years and I didn't lose any weight (DH did, but only the weight he initally put on when we first went vegetarian and he started eating cheese all the time). After that it was the Eat to Live way (Dr. Fuhrman, I think?) which I felt was a healthier, more balanced diet (I should probably be eating like that now) of lots of raw and cooked veggies, beans, and small amounts of starches. No significant weight loss.
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I finally had to come to terms with the fact that I was spiritually lighter (I'd always had deep moral issues with animal foods) and that would have to be good enough. And it has been. In general, I could stand to lose 10-20 lbs at any given time but my weight is pretty stable so I don't gain and lose often (this is a good thing, as someone who has recovered from years of eating disorder, to not yo-yo). My husband (who was always skinny!) sometimes gains weight as well, over the winter especially. We have not found veganism to be a weight loss panacea. However, we have to get comprehensive bloodwork done for our insurance every year and our numbers are always STELLAR. So I know that we're "healthy" even if we aren't at our ideal weights.
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The raw vegan diet is the only way I can get down to what is considered an "ideal" weight for my height, but it's not sustainable for me or my family. But even after several months of the raw diet (and going from a size 12 pants to a size 6), the weight started to creep back on even though I was still eating the same raw foods. It was good for cleansing though, and I'll probably still continue to eat as "high raw" as possible. At 100% raw I found drawbacks, despite my weight loss.