Well, sure. Being love might make people happy, but it's not great advice to give. Someone who reads the article might easily decide to take a walk every night

Well, sure. Being love might make people happy, but it's not great advice to give. Someone who reads the article might easily decide to take a walk every night at 9:30. He might have to rearrange my schedule or miss his favorite TV show, but it's not hard to figure out how to take a walk. But if the article recommended having a significant other—or even just getting laid more often, it just opens another can of worms. Most people can't just decide to have more sex, or to fall in love. So including it alongside habits like waking up earlier isn't very useful.