While coffee has its place on this list, we do want to urge moderation; caffeine does have its risk factors, including insomnia and nervousness.
However, that same caffeine will also boost your metabolism. It indirectly helps with weight loss, as this stimulant effect will help you to burn calories at a quicker rate.
For health reasons though, it’s a good idea to drink only one cup in the morning and one in the afternoon. For best results, drink it black or only with a bit of skim milk – no sugar!