It's probably even easier to get people behind not doing much and acting as if it is significant. The problem that universal basic income is attacking is a larger one than childhood nutrition and produces less feel good public relations. It is also possible to have both universal basic income and provide an independent infrastructure for providing food security...which is also a much less sexy idea problem than feeding malnourished children.

Or to put it another way, the ceiling can be set by considering what the people on the receiving end actually want rather than by people on the giving end.