The rapid growth of population must be controlled. (a) — all sorts of attempts to solve food problems will fail. (b) — we have to increase our food production very rapidly. We may mostly solve our food problem by changing our habit. (c) — we can take potato instead of rice. (d) — it is high time we changed our eating habit. (e) — knowledge of nutritive value of food can help to solve our food problem to a great extent.