Currently you are able to watch "Super Size Me" streaming on Amazon Prime Video or for free with ads on Tubi TV. It is also possible to rent "Super Size Me" on Apple TVonline and to download it on Apple TV.
Super Size Me is available to watch for free today. If you are in Canada, you can:
Morgan Spurlock subjects himself to a diet based only on McDonald's fast food three times a day for thirty days without exercising to try to prove why so many Americans are fat or obese. He submits himself to a complete check-up by three doctors, comparing his weight along the way, resulting in a scary conclusion.