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Be careful what you wish for: people are programmed to like a fat and salt. Fatter salter meats probably aren't as good for you as nice lean salmon... That's without the industrial side of this: meats with built in preservatives and colouring that are actually no good for you but look good and supermarkets will prioritise. I think both GM and lab grown meat suffer from this issue: smart doesn't mean good for you, it…
If the increased tastiness means we eat more of it then it'll be good that the meat is fattier. In terms of macronutrients your body needs a certain amount of fat and a certain amount of protein but not necessarily any carbohydrates. But too much protein can lead to medical problems like gout so ancient hunters who lived off large animal kills tended to prefer the fattier cuts of their kills which were both tastier t…
What is lean about salmon though…? If it was lean it would taste like tilapia.