Did he say why he did not approve salt substitutes?
Her concern was the potassium/sodium deficiencies it can cause. Changing the formula of the salt substitutes may help that.
I take a mild diuretic and I try to stay low-carb, so I don’t eat bananas and other fruits high in potassium as they carry a lot of carbs as well. When I saw her last month, my potassium level was ONE ‘tick’ below normal, so she suggested the supplement.