A study said that? Sure it did, he said sarcastically.
You can find this story going around right now.
Authors refer to this "red meat" as processed stuff like bacon and sausage and hotdogs and such. Here’s what we do know about meat...it does not raise your insulin levels, and chronically high insulin for years on end is basically what causes Type 2 Diabetes. And probably causes Alzheimer's and Heart Disease too.
Sure some of the processed meats may also do that, like maple bacon or sausage perhaps, but hamburgers and hot dogs as far as studies go, are rarely eaten without a bun and french fries and soda and they rarely can tease out that fact.
I know form eating pretty low carb for the past couple years and getting a few Hemoglobin A1C tests which measure your blood sugar levels over a three month period, a plate full of junky carbs like mac & cheese mixed with sausage, will raise your insulin - so will mac & cheese and salmon, mac & cheese and with broccoli, mac & cheese with water, and indeed mac & cheese by itself. Hamburger patties and hot dogs and bacon and sausage does not raise your insulin unless it has some sort of rub or sauce on it. Steak cooked in butter? Nope. Hamburger patty with some salt, nope, and maybe even a slice of cheese can be added and you won't see much of an insulin spike.
They provide no mechanism by which processed meats might cause the diabetes. This is most likely a politicized thing against red meat, a thing we all understand too well these days.
One might as well say that arsenic and red meat causes death. Well, yeah. Maybe ditch the arsenic? And processed sugary junk food is indeed like a slow-acting arsenic.