(NEWS.COM.AU) — THE saying goes that breakfast is the most important meal of the day — but apparently only if you eat the right thing.

Those hoping to hear the full English is the way forward will be sorely disappointed too.

According to William Cole, who specialises in nutrition, what we should be eating first thing is a little more unusual.

He told Mind, Body, Green that a breakfast crammed with fat is the key to maintaining energy levels throughout the day, and eating this way will make you more productive.

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