There is no scarcity of food. So this theory that overpopulation is nonsense. It is also nonsense. There cannot be overpopulation. But there is restriction, by nature. Nature will restrict production of food if there are demons. Nature will not provide the demons.
You'll find in the Śrīmad-Bhāgavatam, Fourth Canto, nature is quite prepared to supply all the foods, but as soon as there are number of demons . . . because the whole plan is to correct. Just like the criminals are sent to the prison house for being corrected so that they may not again commit criminals. That is the purpose of . . . similarly, we are all criminals who are in this material world. The purpose is to be corrected. We wanted to imitate Kṛṣṇa, to become Kṛṣṇa, and therefore we violated the orders of Kṛṣṇa, and that criminality means material life.
- kṛṣṇa bhūliya jiva bhoga vāñchā kare
- pāśate māyā tāre jāpaṭiyā dhare
- (Prema-vivarta 6.2)
This is māyā, this material world, māyā. This body is false, māyā. So we have to accept this body because we wanted to enjoy. So enjoy. You enjoy with this body, particular body. Either human's body, or dog's body, or cat's body, or demigod's body, you get as you desire. You get a material body and enjoy. This is material life.