I recall watching a stop motion nutritional video on VHS starring a kid named Willy Munchright. The basic premise was educating kids about proper nutrition and food groups via wacky stop motion skits. I recall Willy being in a laboratory talking with a professor about proper snacking, but everything else is a blur at best.
Something else worth noting is that the video was sponsored by McDonald's. Ironic seeing as it was about proper nutrition.
I've managed to find one or two short one minute videos of Willy on the internet so I know the character wasn't a fever dream. However I've been unable to find the 22 minute VHS episode I recall watching as a kid.
I doubt it's ever going to resurface but if you want, give it a shot.
And here is the synopsis from the Paley Center (which also states that it's 12 and a half minutes long in total):
"What's On Your Plate?" features 12 animated commercials for children that emphasize the importance of good nutrition. These ads were produced by the advertising agency of Leo Burnett U.S.A. for the McDonald's Corporation. In each commercial, an animated character named Willie Munchright answers a question from his mail-bag about the importance of eating a balanced diet. He divides foods into two basic groups: "everyday" foods and "sometimes" foods. He explains why "everyday" foods, such as vegetables, low-fat meats, fruits, and grains, contribute to better health and why "sometimes" foods, like snacks and sweets, should be eaten in moderation. He also explains why some types of sweets and snacks are healthier than others. The following subjects are discussed: cakes, new foods, different foods, grains, vegetables, fruits, drinks, meat, sweets, fat, breakfast, and snacks.
And finally, here is a list of places (libraries, universities, etc) that have it archived on VHS and DVD, via worldcat (this one says 1993, I guess the copy in the image is a 2003 reprint):