A smaller and more expensive food supply may be the only way we see a decrease in population growth.
Are you suggesting that starving poor people is a good means of population control? It really sounds that way, but I'm hoping it's just my mis-interpretation.
Regardless, I have to disagree. The countries with the smallest and most expensive food supplies tend to be the ones with the highest and growing populations. Wealthier countries with affordable food supplies, such as the USA and most European countries have declining populations. The US population is growing mainly by immigration, not native births. The immigrants are from the countries with limited and expensive food supplies.
The only way to reliably reduce the population is to educate people and give them good economic opportunities.
You're right on here Beforewisdom. People with good economic opportunities, decent housing, cars etc. willingly self-regulate their reproduction in order to maintain their lifestyle. Poor people have little pleasure in life other than their families and so are willing to keep reproducing.
Education and economics go hand in hand as well. It's amazing how many people, even here in the USA, are ignorant of their own bodies and reproductive systems. I have met adult women who did not know that urine and babies come out of separate openings! How scary is that?