&gt;&gt; <i>But that&#x27;s just me. It could be totally different for someone else</i><p>It is. I haven&#x27;t eaten breakfast for 20 years, and I don&#x27;t suffer from any kind of lethargy, tiredness or hunger. I even cycle to work for 30 minutes each day, on an empty stomach, and often don&#x27;t eat until 1PM. For me, it&#x27;s actually the other way around: if I eat anything before lunch time, especially sugary things, I often get nausea.<p>So I guess that confirms your point, there simply is no &#x27;one-size-fits-all answer&#x27;, everybody has different metabolism. Obviously some things are clearly bad for you, like overeating, insufficient dietary variation, lack of essential nutrients, etc. But these are simply solved with just common sense. For the rest, &#x27;nutrition science&#x27; is completely worthless IMO, and more often than not driven by marketing or scientific echo-chambers.