if you are a vegetarian when you are young will u get fat when you are older?!

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Everyone gets at least a little bit fatter when the get older,

Actually, it depends how much you eat, and what you eat.
Some things are more fattening than other things, like corn and bananas,
Nuts and fruits contain oils and sugars, so its just how much you eat.
Vegetarians will be less likely to have problems that Atkins diet people will get, a
and remember, herbivores have longer life spans than carnivores.

That's a good question. I don't think any scientific research has been done.

There are studies that look at the effects of vego vs meat head diets in adults over long time periods (sometimes decades) which indicate that meat consumption can be linked to weight gain and diabetes (Vang et al. (2008). Meats, Processed Meats, Obesity, Weight Gain and Occurrence of Diabetes among Adults: Findings from Adventist Health Studies. Ann Nutr Metab;52:96-104 http://content.karger.com/produktedb/pro… ; Key et al (2006). Weight gain over 5 years in 21 966 meat-eating, fish-eating, vegetarian, and vegan men and women in EPIC-Oxford. International Journal of Obesity 30, 1389–1396 http://www.nature.com/ijo/journal/v30/n9… ).

The most likely predictor of adult weight gain and overeating behaviour in children relates to whether they feel satisfied after eating (Carnell and Wardle (2008). Appetite and adiposity in children: evidence for a behavioral susceptibility theory of obesityAmerican Journal of Clinical Nutrition, Vol. 88, No. 1, 22-29. http://www.ajcn.org/content/88/1/22.abst… ).

So it is possble that if a vego diet fails to sate a child they may develop the kinds of bad habits which lead to weight gain in adulthood. However another type of behaviour called dietary restraint is associated with reduced BMI. This means an individual may be able to overcome the urge to overeat if they have sufficient restraint, in which case their weight will reflect the dominance of either behaviour (American Journal of Clinical Nutrition, Vol. 75, No. 3, 476-483 http://www.ajcn.org/content/75/3/476.abs… ).

Hopefully someone will do a longitudinal study on vego children to get a better idea of what happens in the long term.

vegan biologist

Being vegetarian doesn't guarantee losing weight. If all someone eats is potatoes and butter they'll get fat even without the meat. It doesn't matter whether someone is vegetarian when he is young; he could still get fat as he ages, if he doesn't eat wisely.

If you are vegetarian then you are more likely to maintain an healthy weight throughout your whole life.

Care to explain where that thought came from?

you'd think the question would be the other way around