I tried to save money once by making lunch and bringing it to work. My SO at the time who was much more frugal than me pointed out that eating lunch out (socializing) was much more important to them than the savings which over the course of a month was not that much, especially if you factor in the cost of time and that there were way more effective ways of saving money than giving up socializing time.

It was also boring (for me) in that in order to save time and money I'd end up having to make a larger portion of one thing and then eat the same thing all week.