There are options. Try using a product like losalt which is about 30% sodium and 70% potassium (which helps lower blood pressure) salt. There are delicious varieties of olive oil to use instead of butter. Olive oil (use cold or low temp cooking) has many health benefits. Then try clarified butter, called ghee, in tiny amounts if you still want butter flavor. It never goes rancid - will keep for years outside the fridge.
Butter. Butter as clarified butter is healthier than salt.