If one of your goals for 2020 is to adopt better eating habits, you’re not alone. Along with exercising more, it tends to top the list of New Year’s resolutions each year.

What should I eat? It’s a simple question that stirs up conflicting answers—and a lot of confusion. Vegans, vegetarians, and paleos debate the pros and cons of dairy, grains, beans, even bacon.

It’s 2 p.m. and your energy is flagging. Before you power through that candy bar or load up on caffeine, reach for a snack that will boost your brainpower instead.