Underweight twins - should I be worried?

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Hello everyone, my DT's are six years old and are very active (aren't all boys at this age!) Anyway, I have tried the child BMI calculator and they both come out as slightly underweight. Am I not feeding them enough or are they burning it off? I saw a doctor last week for DT2 (unrelated to weight) and he commented on how skinny DT was. They seem to eat tons of food, bad with veggies but great with fruit. Any reassurance for anyone in simiar circumstances very welcome. TIA

my dd is very skinny, as was I (I was investigated at GOSH for failure to thrive, and nowt was ever found). As long as they're healthy, I doubt it's a problem.

dont worry its because they are very active, twin boys at six are bound to be on the go all the time, some of my boys are like twigs ,they just seem to get taller , not any heavier, guess what? they both play football for school/local clubs and most of their friends are the same ,theyll fill out one they start to slow down a bit, usually at late teens,try not to worry, theyll be fine

If they are otherwise healthy I wouldn't worry, just tried to provide them with healthy diet and may be vitamin complex if you feel necessary.....but it seems pretty natural to me since they are active and have a good apetitite.bless you all....