When food was scarce, our ancestors' survival depended on conserving energy, and regaining the weight when food was available would have protected them against the next shortage.
Apabila makanan terhad, hidup nenek moyang kita bergantung pada penjimatan tenaga. Kenaikan semula berat apabila makanan kembali ada dapat melindungi mereka terhadap kekurangan berikutnya.