If the incoming fund does not suffice to meet the basic needs of 3x meal a day, then the family need to adjust by reducing the meal, or the provider looking for an additional source of income. Very low does not necessarily means it is not enough for the basic needs. These families manage well because they do plans and budgeting in order to make their income fit the budget. The family is probably does not engage in extra spending and mostly each penny in their hands is smartly budgeted and allocate to needs.
In our case, we did not reduce the number of meals per day but rather we decrease the amount per serving and also some ingredients for it. In that way we can still have the good number of meals per day and we can manage our finances so well. We are avoiding spending in house deliveries of foods and other items , maybe we will only by those things if there's special occasion. We prioritize things that we need over our necessities, inflation is hard here.