It helps that we’re right. That it can’t be bad to eat what humans have eaten for 2 million years.
But 2 recent things I’ve looked at were studies done a few decades ago and shelved because they didn’t get the “right” answer, but were recovered recently and published showing the lipid hypothesis was wrong and the cause of metabolic disorder was carbohydrates
They were suppressed in the 70s and 80s, now they are published. Dietary guidelines in Australia (one of the biggest wheat exporters) now allow low carb for treating type 2 diabetes.
I do believe we’re watching a change in consensus (which as always is progressing one death at a time - perhaps it’s good that the other side is committed to a metabolically dangerous path)
Ruminants, which include beef cows, are part of the normal carbon, and water cycles. The water ruminants drink is mostly peed out onto the land. Ruminants when eating their natural pastoral diet do NOT want grains, and do not need grain grown inputs.
Regardless of where you sit on the Arable / Pastoral debate, one unifying thing that is critically important is top soil health and depletion. Ruminants are a critical part of maintaining and growing top soil! Most industrial grain production is monocroping using exogenous fertilizers. Sustainable agriculture requires we incorporate ruminants to replenish topsoil (crop rotation, etc). Those exogenous fertilizers will run out eventually (some reports say we have between 30-60 “traditional” crop cycles left in the current system).
In the industrial system grain waste is used to feed ruminants, but that isn’t super healthy for the ruminants