Gaining

Does minimum wage sufficiently fund gaining?

In my opinion, not really. This is dependent on living situation, country you reside, etc.

From a US standpoint, no, it’s not possible as all of your money would be used on housing/trying to have groceries.

It can depend on the job. If you work at a restaurant, there can be lots of cheap or free food available. It's how I gained around 100-150 pounds.