Every year, when Valentine's Day gets close, almost every store is packed with assorted heart-shaped chocolates. As companies put effort into making chocolate the candy of love, it seems that the health effects of chocolate are put in the spotlight more and more.

Fifty-eight million pounds worth of chocolate is bought in the United States in the lead-up to Valentine’s Day. Here is how the box of chocolates became the go-to Valentine’s delight.

Valentine’s Day is a notoriously difficult holiday for gift-giving. The equation for the perfect gift is endlessly variable — and changes along with every shift in relationship status. We’ve picked a gift for every stage of a relationship,