My entire body starts to shiver uncontrollably when I don't eat for a day (the energy throughput of my body is crazy throughout a workday), I can't believe it's

My entire body starts to shiver uncontrollably when I don't eat for a day (the energy throughput of my body is crazy throughout a workday), I can't believe it's healthy and productive not to eat for 3 days in a row. I'd even say this is quite dangerous and unproductive advice. I advise everyone reading this not to do multiple days of fasting without consulting a doctor.