Scientific Eye – Diet & Nutrition – a 19m video:
The Human Body – Digestion – a 5m 28s video and how Teeth grow – a 4m video.
Science Bank – Food & Digestion – a 14m 28s video.
Science in Action – Animal Nutrition – an 19m 12s video.
KS3 Bitesize foundation level – Humans as Organisms part 1 – a video covering Nutrition & the Digestive System plus other stuff.