It is sometimes difficult to determine which foods are healthiest, with study after study showing something different each time. Just when a particular food is acclaimed for providing some healthy asset to a diet, it is subsequently found to be detrimental in another way. Consumers find it difficult to know the difference and balance all of the information.

All twenty foods that Williamson listed have been combined in this week’s HealthNews Dozen list, as some are similar. Five different kinds of berries were grouped together, as were the two kinds of teas black and green. Many consumers will be happy to see that coffee and dark chocolate have made the list, as items are the guilty pleasures of many.

It should be noted, however, that all of the items on the list should be ingested with some moderation and common sense. Drinking an entire pot of coffee in one sitting, for example, is likely not what nutrition professionals would advise for lengthening one’s life.

Similarly, it is doubtful that an entire box of dark chocolate candy would be prescribed by anyone in the health or medical field. However, in moderation, all of the foods named by the professor have the potential to add to one’s chances of a longer, healthier life.