Some gelatin can come from seaweed, I think it may be called agar agar, unfortunately you can't always tell which.
I went vegan to see if it would help my IBS, and now that it has, I'm going to stay this way because of the cruel conditions animals are put through.
I don't believe that anyone should drink cows milk. Cow's milk is the perfect food - for baby calves who gain like 300 pounds in 13 months. No other animal other than humans drink another animals milk. Ignoring the fact that milk tends to leech calcium rather than give it, and ignoring that milk isn't easily digested, and ignoring that the pus levels in milk in North America are considered dangerously high in other continents, milk cows are artificially inseminated, literally raped, in order to keep an unatural flow of milk going year round. A normally 25 (or so?) years of life is usually cut by slaughter by 3 - 5 years.
As for eggs and meat, humans were not originally hunters who ate some berries sometimes. Humans were scavengers! We'd eat whatever we could find. Our digestion systems and our teeth are much more related to herbivores.
Our ancient ancestors, chimpanzees (I think... boy I'm tired) have been shown to be herbivores who can occasionally gang up and eat lower species of monkies, not often though, and not to the gross extreme that is the S.A.D. (Standard American Diet)
Anyways, end rant. I don't want to be too preachy, but the horrors that animals are put through, and the horrible lies the meat industry tells consumers (the myth of 'free-range' and 'cageless' chickens for example) just make me sick. I'm turning into such a fundamentalist vegan....