For
It gives energy and starts metabolism.
Against
Many people function well without it.
Anonymous excerpts, translated where noted.
“Breakfast is the most important meal of the day for me; without it I don't leave home or even wake up completely!”
“Because you haven’t eaten for a long time (ie your body needs calories to burn for the day).”
“Meal timing and frequency is a very minor consideration compared to what you eat in total.”
“It has literally no effect on me, I have plenty of energy, my brain works just fine, and I'm in good shape.”