Citrus restores fluid balance

We think of dehydration— and the tiredness it triggers—as a summer blight, but 75% of us are prone to dehydration in the winter, thanks to moisture-robbing dry air and a 40% drop in thirst response on chilly days, Cornell researchers say. To boost hydration—and energy!—by 42% in one week, enjoy a couple of oranges or other citrus daily. Citrus is mostly water, but it also contains minerals tissues need to retain fluids so they aren’t lost through your skin and kidneys.