If you want an easy way to add more greens to your diet, try a green smoothie. Just blend together a bunch of frozen spinach+banana+apple (my default), or spinach+banana+frozen blueberries (tastes chocolatey for some reason...), or whatever combo of leafy greens+fruit you want. It tastes awesome, and it makes it super easy to get a pound or more of greens every day.

Has anyone actually felt noticeably different when going healthier, though? Or is it more a long-term thing? I went from a pretty average lifestyle (macaroni and cheese everyday, and no exercise except walking everywhere) to a super healthy one a couple years ago, but I can't say I feel any different. [Though I haven't been objectively measuring myself in any way.]