The candy originated in the United States in 1941, and M&M's have been sold in over 100 countries since 2003. They are produced in different colors, some of which have changed over the years. The candy-coated chocolate concept was inspired by a method used to allow soldiers in the Spanish Civil War (1936–1939) to carry chocolate in warm climates without it melting. The company's longest-lasting slogan reflects this: "Melts in your mouth, not in your hand." A traditional milk chocolate M&M weighs about 0.91 grams / 0.032 ounces and has about 4.7 calories (kcal) of food energy (1.7 kcal from fat).