When the roadies strike the stage and load the trucks for Billy Joe Armstrong's pop-punk band, some might say that's Green Day Packing. In 1919, when Frank Peck gave Curly Lambeau $500 for team uniforms, that was the start of the Green Bay Packers.

And when you go and pack big greens into your diet, you'll have "The Time of Your Life," teaming up with these defenders of really good health.

A new study, published in the “Journal of the American College of Nutrition” says that spinach is packed with thylakoids (little packets of goodness found in a plant's green-making chlorophyll) that actually make you feel fuller, block fat digestion, and boost weight loss and reduction of bad LDL cholesterol.

The researchers fed overweight and obese women 5 grams of spinach extract before breakfast for 12 weeks.

But we say the smartest move is to make every day a Green Day.

Spinach, kale, collards, beet greens, watercress, Swiss chard, and arugula pack the powers of thylakoids, plus much more.

They're also huge sources of fiber, and vitamins C, K, and anti-aging A (which makes skin smooth and soft). In addition, there’s with folic acid (which guards your heart and memory, and fights birth defects), lutein (a vision protector), and essential minerals such as calcium, magnesium, iron, and potassium.

Go for two servings a day (1 cup cooked, or 2 cups raw). Or spin some leaves up in a blender in a tasty green drink with berries for sweetness; make it 3 parts greens to 1 part fruit.