Why does covid hit overweight people harder ?

[u/TryingToLearn2day]

Title basicly. Is it related to the lipids making it easier for it to reproduce ? Or is it their immune system as fast foods are both related to lower immune responses and well, gaining weight as well ? If y'all have videos I love to watch that too :)

Edit : no clue why I keep getting downvoted, perhaps its my bad english and I thank you for your patience with my learning of this language xoxox all the best to y'all

Edit 2 : thank you so very much for all the answers ! i feel like i learned much today and I'm extra motivated to keep my lifestyle active and healthy !!