This study sought to assess the effects of a salt substitute (62.5% NaCl, 25% KCl, and 12.5% flavorings) on incidence of hypertension and hypotension among older adults with normal blood pressure.
https://www.sciencedirect.com/science/article/abs/pii/S0735109723082633?via%3Dihub
Margarine I can understand, but aspartame is likely the most rigorously studied food additive of all time. Anecdotally and in contrast to your experience, I’ve been healthier since I swapped sugar in drinks to artificial sweeteners. But if it works for you, the numbers are the numbers, so keep at it. I once lost 20 pounds over the course of a year in highschool by swapping my lunch for a pack of Twinkies. Turns out calories in<calories out works no matter what you eat.
You can both be right, because trying to make more conscious health decisions is what actually made you healthier.