I'm in my late 40s, and I was shocked to find out several years ago that I'm the happiest when I just eat meats/proteins and veggies. While I like fruit, it generally makes me feel crappy, almost as bad as with processed carbs. It helped that I also "discovered" sauteed greens, which really helps boost many of my meals now.
Fruits are all sugar, they're nature's candy. They've also been genetically modified to be bigger and sweeter than they ever were before industrial farming.
work on GMO papayas and bananas is to render them less susceptible to diseases.
Bananas in particular are a triploid, so any given strain is effectively one big clone propagated by vegetative cutting, hence the lack of seeds. This leaves them unusually susceptible to funguses, which can adapt to them, while they can't remix their genome to adapt back.