12. Spinach
Leafy greens like spinach are rich in iron and magnesium, two minerals that play a role in energy production and metabolism. Low iron levels can slow down your body’s ability to burn calories, so adding spinach to your diet can help keep things running smoothly. It’s also low in calories but high in fiber, which encourages digestion. Spinach blends easily into smoothies, omelets, or salads.