How can people know what's sustainable? It's relatively easy to know what's grossly unsustainable, or it would be if people weren't pervasively lied to about what they ought to be able to sustain, but knowing what's sustainable over the long haul is a harder question.
It's not easy to know, no. Looking at what other people are finding sustainable, doing a bit of reading, etc. would help, but nothing outside of experience is going to give a firm answer.
But just knowing that there's no point doing the kind of diets that last you a month is worth knowing.
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But just knowing that there's no point doing the kind of diets that last you a month is worth knowing.