The argument has been made that blood glucose essentially is the resource that gets depleted when you're low on willpower. Using willpower is an energy-intensive brain activity, so it's hard to do when your blood sugar is low. Some of the studies that have shown this have given people a sugary drink to restore their willpower, but that's probably not the way to go in real life since it'll cause a temporary spike in blood sugar followed by a crash. But it's possible that fixing your diet to avoid low blood sugar could improve your willpower.

There have also been several studies looking at immediate interventions that can counteract the drained battery effect. In other words, people come into the lab, they do one task that drains their willpower, then they get some intervention that might restore their willpower, then they do another task that requires willpower. This review by Baumeister, Vohs, and Tice (pdf) lists a few that have worked and gives citations:

• Humor and laughter
• Other positive emotions
• Cash incentives
• Implementation intentions (‘‘if ... then’’ plans)
• Social goals (e.g., wanting to help people; wanting to be a good relationship partner)

Any chance you could remove all the newlines in the quotes? They're pretty unreadable

with random

newlines.