If anyone knows about making smart decisions, it’s author and academic Noreena Hertz.

She advises CEOs, prime ministers and presidents and her new book, Eyes Wide Open: How to Make Smart Decisions in a Confusing World (William Collins) is your new bible for making the right choices in all areas of your life.

Noreena writes about how we can all improve our health, wealth and relationships by making better decisions in the October issue of ELLE.

Here are some fascinating facts from Noreena’s research:

- Each time we check an email it takes 22 minutes to return to our task at the same level of focus.

- We make 10,000 trivial decisions every day. 227 of these are about food

- Surgeons, when fatigued, are 22% more likely to make errors than when properly rested.

- Shoppers are 84% more likely to buy shoes in a fragrant room than a non-fragrant room.

- Reports have shown that making decisions you’re overtired is equivalent to making them when drunk.

Read Noreena’s piece about making smarter decisions in the October issue of ELLE, on sale now