How did our country get so unhealthy? In this second part of a series, ?Our Deteriorating Diet?, I explain what caused our weight gain and its inherent health risks. Many experts claim we, Americans, just eat too much. Is it just a matter of calories in versus calories out? Are we really eating too much or is it what we eat? Do man-made substances in our food supply really make a difference in our ability to maintain a healthy weight? Find the answers to these questions, and other interesting facts you wont see anywhere else.

Humans are carnivorous animals and the Stone Age diet, Dr Voegtlin challenges, was primarily one of a meat and fat eater. Like the carnivorous dog, our jaw moves in a vertical motion. A herbivores’ jaw moves in a rotary fashion. We have canine teeth, ridged molars and incisors designed for crushing and tearing. Unlike herbivores that lack canines and have flat molars, mastication is unnecessary and we do not ruminate or chew cud. Our stomachs hold two quarts, empty in about three hours, secrete hydrochloric acid, lack bacteria and cannot digest cellulose. A herbivorous sheep’s stomach holds eight and a half gallons, never empties, digests cellulose, and bacteria are vital to its function. A herbivore’s stomach doesn’t secrete hydrochloric acid, which is primarily for the digestion of protein. Carnivores like man feed intermittently while herbivores continuously feed (graze). A herbivore’s digestive tract is five times the size of man’s relative to our body size. Unlike herbivores, man’s colons are short and our rectums are small and do not contribute to digestion. Man’s gall bladder has a vital function and is well developed. The function of a herbivore’s gall bladder is weak or nonexistent because of the lack of fat in their diet. The volume of feces from man is small because our digestive efficiency borders on 100 percent. A herbivore’s feces are voluminous because their digestive efficiency is less than or equal to 50 percent, and they must eat large quantities of food.

Men’s Fitness.com helps you get the crap that has been accumulating in your fridge since winter.

Things to Trash:

High-calorie dips, spreads, and condiments
Bye-bye, nacho cheese sauce, French onion chip dip, blue cheese dressing, and mayo. In their place, swap a couple of varieties of salsa, vinaigrette dressings, and mustards, and other low-carb steak, barbecue, and cocktail sauces that are free of added sweetners.

Fruit-on-the-bottom yogurt
It’s typically more sugar than anything else. Instead, stick with sugar-free, plain variety (mix in your own fresh fruit and nuts for flavor), or Greek, which is loaded with extra protein.

Extra Beer
Sure, you need one . . . maybe two . . . some nights. But unless you’re having a party, only chill a couple at a time. If the beer isn’t there, available and cold, you’ll be much less likely to overdo it on a nightly basis.

Things to Stock up On:

Lean proteins like chicken or turkey breast, fresh fish, and red meat
Buy in bulk at a wholesale grocery, split the family-size packages into smaller bags or containers, and freeze smaller servings to save money.

Lots and lots of produce
Strive to eat things with one ingredient, the food itself. Broccoli. Spinach. Apples. Get it? Buy precut veggies to save time on prep. But only buy what you can eat one week at a time. Otherwise, the excess is bound to go to waste.

A giant water pitcher
Get yourself a good water filter and keep it topped off at all times to prevent you from using those wasteful plastic bottles. Every time you pour a glass, top off the filter so you have cold water at arm’s reach when you’re thirsty.

Click here to check out things that you need to clear from your pantry, as well as things to stock it with.

If your diet needs a boost, you might want to check out MensFitness.com?s top 20 fittest foods.

Here are MF’s top 5:

5) Broccoli
31 calories per cup
Eat 2-3 half-cup servings per week
This fleshy green should be at the top of your list when it comes to vegetables. It’s rich with a healthy supply of iron, calcium, fiber, and vitamin C, meaning it’s good for the circulatory system, bones, and fighting colds. “As far as vegetables go, this is the one I try hardest to get more guys to eat,” says Niki Kubiak, R.D., a private practice nutritionist in Omaha, Neb. Brocco-phobic? Try it on the sly: Slip it into stir-fries, onto pizza, or use raw chunks as a vehicle for your favorite dip.

4) Tomatoes
83 calories per cup
Eat 4 servings per week
Yes, it’s true that tomatoes used to be called “love apples” and have a reputation as a powerful aphrodisiac. But that lore has nothing to do with why we picked the tomato as the best food for sexual health. Rather, tomatoes win their place on our chart-and their relatively high ranking overall-because of a single nutrient: lycopene.

This powerful antioxidant, which comes from the pigment that gives tomatoes their red color, may actually help fight off a number of diseases and ailments-most important for men, prostate cancer. Numerous studies show that men who have the most tomatoes and tomato-based products in their diet are less likely to develop prostate problems than men who rarely eat the stuff. And the good news for guys on the run: Tomatoes are also that rare food that’s more nutritious when cooked than when eaten raw. “Lycopene becomes more bio-available to the body after it’s been heated,” says nutritionist David Ricketts, a prostate-cancer sufferer who used his disease as the motivation for writing the cookbook Eat to Beat Prostate Cancer. “You can start off the day with a glass of tomato juice and have a tomato-based sauce a couple of times a week. However you can work it in, you’re pretty much on the way.”

3) Oatmeal
148 calories per half cup
Eat 3-4 servings per week
When it comes to eating breakfast in the morning, there’s nothing better than a bowl of oatmeal to spike your energy levels and provide you with an hours-long supply of fuel. Oatmeal is also filled with stress-fighting and immunity-boosting zinc.

If that weren’t enough to convince you to pop a bowl in the microwave, keep in mind that oatmeal can also help promote weight loss and lower your risk of heart disease. Oatmeal is filled with high levels of soluble fiber that protect your heart and arteries by trapping and expelling cholesterol, dropping levels by up to 30 points or more in some cases, says Kubiak.

The best oatmeal may not be the most convenient, however. Those flavored, single-serving packs that litter grocery-store aisles are often filled with added sugar-and therefore excess calories. Instead, stick with the big tub of instant oatmeal and add your own fruit and calorie-free sweeteners, if you need them.

2) Blueberries
41 calories per half cup
Eat 1-2 cups per week
Of all the fruit you can eat, blueberries may be the absolute best. Whether you’re getting them raw, tossed into cereal, mixed in fruit salad or a smoothie, blueberries pack more fiber, vitamins, and minerals per ounce than any other fruit in the produce aisle. Chief among those nutrients are free-radical-fighting antioxidants. Free radicals, which increase in number as you get older, travel around your body damaging cells, promoting disease, and triggering signs of premature aging. And blueberries harness the firepower to knock them out of service.

Need another reason to eat them? How about your memory? Those same antioxidants that fight disease are also effective in helping keep connections between cells in your brain and nervous system healthy, ensuring clearer, quicker thinking and the best memory possible.

1) Salmon
121 calories per 3-oz serving
Eat 3-4 servings per week
Salmon tops our list for a number of reasons, but the biggest has got to be because its so densely stuffed with omega-3’s. These fatty acids are thought to slow memory loss as you age and boost heart health by regulating heart rhythms and keeping arteries and veins supple and free of blockages. While saturated fats lead to obesity, the polyunsaturated fatty acids in fish appear to correct and prevent obesity, according to a study published in Clinical Science.

And that’s just the tip of the iceberg. Salmon is also an excellent source of protein. A three-ounce cooked serving contains 20 grams-making it ideal for building muscle and trimming fat. Besides helping stimulate your metabolism three to four times more than carbs or fat, protein is the absolute best food for helping fill you up, so you take in fewer calories and burn more. And that’s what being a fit food is all about.

To see the entire top 20 list, click here.