Even foods that are good for your health may have some properties that make them less than ideal. And some things that you eat are just plain bad for you. Lectins are often cited as a property in foods that you should avoid.
DS-Lite is an IPv6 migration technology, where the access network of the service provider is running IPv6.
A larger model of the DS Lite was an unreleased alternative to the DS Lite. It was ready for mass production but Nintendo decided against its release as sales of the DS Lite were still strong. Instead Nintendo prepared the DSi and released a  DSi XL  version of that console a year later.