A few of us at AskMen have completed P90X and have seen amazing results. However, when we were finished we wanted more -- more fitness, more good food, more Tony Horton. So, we interviewed him, asking him questions we thought were pretty typical of the average P90X graduate. Your response was so great that we thought it would be a good idea to have Tony write a column for us -- and he did too. Without delaying your fitness education any longer, here is Tony Horton's first-ever column series on AskMen.

When I begin training new clients, the first thing I do is ask them about their diets. Because if you want to get major results, you have to cut out what I call "food porn" -- food that's doing nothing to fuel your body and, in some cases, actually doing more harm than good. To keep things simple, I tell them there are five bad foods that they absolutely, positively, must stop eating and drinking if they want to achieve their fitness goals.

1- Processed sugars

I'm talking about white sugar, high-fructose corn syrup, sucrose, or pretty much any kind of sugar that came from a factory instead of a piece of fruit. Processed sugar negatively affects your metabolism, your insulin response, even your mood -- and all for totally empty calories. And cutting sugar out of your diet means you're going to have to read some labels, because it is by far the most common additive of all the bad foods in the U.S.

2- Alcohol

Calories from alcohol are as empty as sugar, and at seven calories a gram, booze can really pack it on. Alcohol also dehydrates your body, which compromises muscle growth; plus, it slows your metabolism, so you burn fewer calories. So drinking gives you less muscle and more fat -- you're just undoing everything you're trying to achieve with your workout.

3- Caffeine

I know there are a lot of people out there that say caffeine can give your workout a little extra oomph. Obviously, it can give you some extra energy to make you push harder, but the cost is that it increases cortisol levels in your body, which inhibit lean muscle growth. Plus, it can affect your sleep patterns, and you're better off working out when you're rested than when you're juiced.

4- Anything with a face

It used to be that you could find some decent lean meat sources, but in the last few decades the hormones, antibiotics and chemicals that have been used to process meat and fish make them bad foods and pretty worthless as a source of protein. There are plenty of excellent vegetarian sources like beans, tofu and nuts, so you can eat clean while you get lean.

5- Gluten

Gluten is a grain-derived protein found in lots of different foods, mostly in wheat, rye and barley products. The name is from the Latin word for "glue." You don't need to eat glue. Even if you're not one of the millions who are sensitive or allergic to gluten, you will be operating a much cleaner machine if you cut it out of your diet. There are plenty of other healthier whole grains like millet, amaranth, quinoa, and oats.

bad foods no more

By eliminating these empty or harmful "foods" from your diet, you can start turning your body into the well-oiled machine nature intended it to be. Eating a diet rich in fruits, vegetables and whole grains gives you the premium fuel to get into the best shape of your life. Cut out the bad foods.