Can you imagine wearing that amount of armor and not a McDonald’s withing riding distance.
Sorry, but that’s a fallacy. The armor seen in museums and private collections are small for a reason. They were shown to the knights as samples, and then the armor was built to fit the knight. History Channel leaves a lot to be desired.
A small man could not carry the weight of the armor needed in battle (remember it was IRON) and still move as deftly as war demanded. They also had to carry shields and broadswords, neither of which could be wielded by small men.
Knights were the best-fed, best-paid athletes of their day. They were not small and thin, or they could not have done what they did. And a lot of them outlived their contemporaries due to the better food and life-style.
Some were killed in wars, but for the most part, knights were awesome men. They were called knights, because they were knighted by the King and given the title “Sir.” This, too, was because of their prowess and bravery in wartime.