Some people can eat some sugar without harm, while others should avoid it as much as possible. According to the American Heart Association (AHA), the maximum amount of added sugars you should eat in a day are (7): Men: 150 calories per day (37.5 grams or 9 teaspoons).
Alistar [al-is-tar] as a boys' name means man's defender. Alistar is an alternate form of Alastair (Scottish, Greek): Scottish form of Alistair.
Contrary to the previous poster's comment, Arwen does not mean evening star.. Evenstar was the surname of Tolkien's character Arwen, not the meaning of her name. In Sindarin, the ar prefix means noble,  and -wen means maiden, so the BtN definition is correct.