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“because of the salt and protein being hard on kidneys”

If a person doesn’t have kidney disease, salt and protein aren’t a problem.

Does a High Protein Diet cause Kidney Disease? [WARNING: Myth Alert]:

https://www.youtube.com/watch?v=IjQColM-q44

Protein and kidney health - Diet Doctor:

https://www.youtube.com/watch?v=CHLgAaGxfkQ

“The first observational study followed 2,255 patients aged 60-80 with a history of myocardial infarction (heart attack). They filled out a standard food frequency questionnaire (which as we have reported before is frequently inaccurate and unreliable) and followed the GFR (a laboratory measurement of kidney function) after 41 months.

Observational trials like this provide weak data compromised by uncontrolled confounding variables. For instance, in this study those who ate more than 1.2 grams per kg of body weight per day (g/kg/d) of protein averaged 2,250 calories per day. Those who ate less than 0.8g/kg/d averaged 1,346 calories per day. That is an almost 1,000 calories per day difference!

But wait, there’s more. The higher-protein consumers also ate 268 grams of carbohydrates per day, compared to 173 grams per day for the lower-protein consumers. Finally, the high-protein group also ate 1,300 mg more sodium than the lower-protein group. While sodium may not be all that important on a low-carb diet, on a higher-carb diet, sodium intake likely does correlate with poor health outcomes.

Interestingly, the authors concluded that the higher-protein group had a more rapid decline in kidney function. But here’s the best part. We can also conclude that the group that ate more carbohydrates or sodium had the more rapid decline in kidney function. They just happened to all be the same group.”

https://www.dietdoctor.com/do-low-carb-diets-harm-kidney-function