I agree that we need food. Why do you say it needs to be as cheap as possible? The cheaper it is the less value people will give it and the more food will go to waste.
The problem is not the food price. The problem is the unfair distribution of wealth. The solution is to ensure every person can afford a decent standard of living.
Making food cheaper just shifts the problem: More food imported (=>traffic, noise, co2), less incentive to produce food (=>scarcity), worse conditions for workers and livestock (=>unequality, animal abuse), higher reliance on preservatives, pest control and drugged livestock (=>potential negative side effects), more food waste (=>inefficiency).