Hey Ken,
Congratulations on the weight loss, and welcome to the forum!
As for a healthy butter substitute... I think it depends on what you need it for, as Tik has already asked.
I just quickly looked through the cupboards, and it looks like olive oil and grapeseed oil have approx. the same calories per tbsp. When compared to butter (salted), olive and grapeseed oil have no cholesterol, no sodium (salt), and way less saturated fat than butter. These would work for cooking many dishes, but I'm not sure what a good substitute in baking would be.
I looked up the nutrition facts on butter here:
so if you're curious, you could look up many different oils, butters, margarine, etc.
Cheers,
PLB
PLB