Maybe it's the unknown or maybe it's bec of change. Some people don't like change. The older we get the harder it is bec we get comfortable in our patterns.
If you're fortunate enough to make that change & are ready for it then take the first step. Yeah it'll be scary, but think of how much healthier you'll feel.

Not all of us can do that. I'd like to be in your shoes. It takes courage to get yourself ready for the next step so keep going. I'd like to move forward. Fear keeps me in my dead lifestyle.
Wish you all the best.