Everything old is new again, as is common with all sorts of trends, but now Millenials are seeking out a simpler, more nourishing philosophy of food. Thanks to their renewed commitment to health, the principle of "eating clean" has found a home in this demographic. And, for some of their parents as well.

Eating clean is a new way of referring to a relatively longstanding mindset. In the 1960's, the natural food movement rejected processed foods, which were wildly popular at the time, not for health reasons, but rather for ethical ones. Today, it's about choosing more nourishing options than those offered by giant corporations that use unrecognizable chemical ingredients.

The whole idea behind eating clean is a reliance on healthy, whole and unprocessed food. Rather than counting calories, or restricting oneself to one kind of food (like, for instance, only those low in carbohydrates), this guiding philosophy is more a lifestyle, a consciousness about what qualifies as nutritious. Those who practice it find that it gives you more energy, and because it's flexible and thus adaptable, regardless of your unique routine. For our modern times, where people generally feel pressed for time and always in need of quality fuel to burn, it's the perfect fit.

To adopt the "eating clean" mindset, you won't have to keep up with complex formulas or calculations. Fortunately, you'll only need to understand six essential principles of this dietary philosophy, as follows ...

1. Stop eating processed foods in favor of whole, natural foods. A simple rule to remember is that if it comes in a box, can or brightly colored packaging, it's probably processed. Your grocery cart should be full of color, but only natural colors - fruits, veggies, nuts ... you get the idea.

2. Just say "no" to refined foods. Obviously, it takes a great deal of effort to do this 100% of the time, but committing to a daily intake of whole grains from sources like brown rice, quinoa, amaranth and millet is definitely the way to go. And don't forget legumes and beans, as they're great vegetarian sources of protein. You'll also want to end your consumption of high fructose corn syrup, opting instead for sugars from maple syrup, honey and dehydrated sugar cane juice.

3. Say "goodbye" to meals with huge portions. Instead, spread out your consumption with 5-6 small meals evenly spaced throughout your day. These meals don't have to be all exactly the same size. A less drastic change for people who are accustomed to eating breakfast, lunch and dinner is to have three primary meals with small snacks in between. By adopting the small-snack strategy, you'll be less inclined to overeat at your main meals. Additionally, you'll find that spacing out your meals and snacks will help keep your energy up and your blood sugar levels even.

4. Every meal should include proteins, fats and carbohydrates. Most Americans don't need to be told to consume carbs and fats, but we often fall short when it comes to protein intake. Not only is protein essential for healthy muscles, it's great for curbing your appetite. Like with almost anything in life, balance is key.

5. Don't overdo it when it comes to the consumption of sugar, fat and salt. Don't worry, it's not that difficult when you eliminate processed foods from your diet. As you live with your new mindset, you'll soon find this is true, because clean foods are typically low in all of these ingredients.

6. Remember to move your body. Just as important as consuming clean foods is using that fuel to power regular physical activity. Establishing an exercise habit may be challenging at first, but within just a few weeks, it'll become second nature. Not only will you feel better, you'll sleep better too! And when you're burning that healthy fuel, you'll be decreasing your body's store of fat while also building your muscles. Soon, you'll be burning more energy even when you're resting, with the added benefit of improving your heart, lung and bone health, too!

We hope you'll start adopting some of these super healthy clean food attitudes and habits. We guarantee that once you commit to living healthier, you'll be able to enjoy the fruits of clean eating.