The link between sugar, willpower and growth mindsets

There’s an interesting post on Priceonomics entitled Does Sugar Help You Focus? It cites a study whose authors include Carol Dweck, famous for her work on ‘growth’ versus ‘fixed’ mindsets.

The key finding is in the graph below:

The Effect of Sugar and Mindset on Self Control

The graph is perhaps best summed up by this quotation from Dweck:

“When you have a limited theory of willpower, you’re constantly on alert, constantly monitoring yourself. ‘Am I tired? Am I hungry? Do I need a break? How am I feeling?’ And at the first sign that something is flagging, you think, I need a rest or a boost.”

I’m guessing the same would be true for coffee…