English to Persian (Farsi) Medical Medical: Health Care

Hello,
How would you translate 'it's evolution way of helping us' in the following text?
Cutting calories significantly may not be an easy task for most, but it’s tied to a host of health benefits ranging from longer lifespan to a much lower chance of developing cancer, heart disease, diabetes, and neurodegenerative conditions such as Alzheimer’s. One consistent observation is that when mammals consume less food, their body temperature drops. It’s evolution’s way of helping us conserve energy until food is available again.