‘‘Decision fatigue’’ could be hurting your health, a nutritionist explains. You're standing in a supermarket aisle, weighing up whether to buy a microwave meal or a bunch of fresh carrots. We all know making healthy eating choices can be tough. That’s especially true if you are hungry, or have a hungry household to feed. There are so many reasons for this, and many are outside our control. But one you might not be aware of is a psychological concept known as ‘‘decision fatigue’’. So what exactly is decision fatigue? And could it help or hinder your healthy eating goals? Decision fatigue, also known as choice overload, describes what happens when we make many effortful decisions over time. Whenever you make a decision, you use a small amount of mental energy. As that energy runs low, you tend to make worse decisions. This means you’re more likely to act without thinking, or simply choose what is easy or familiar. You might also find it harder to plan ahead and resist certain impulses.…