My hair used to be blonde when I was little, but it’s gotten darker the older I get. I joke with people sometimes that it’s because I often eat seaweed (wakame, nori, mozuku, kombu…) now that I live in Japan. Students used to believe me, but they’re not quite as gullible these days.
“to scarf (down)” is an Americanism that means “to eat a lot and usually quickly”, similar to パクパク食べる. It’s usually used to talk about junk food, rather than healthier food, though.