Choosing the correct word please

Could a teacher please tell me how to phrase the following?

I told her what I think she should do from/based on my [own] experience.

I wore the dress that made me look [less/the least] pregnant.

She has tree trunks for/as ankles. [do you say this or never in terms of it being natural?]

Does this sentence read correctly and natural?
People shouldn't try to save on/for health related issues like buying generics or going to the doctor less in order to save money.

Thank you