1. Dairy

At some point, I really should write an article that's entirely devoted to why dairy isn't the best thing for our health, along with the alternatives that make switching well worth your while. For now, I'll just suggest that you read about why it's not good for your vagina here and then also file it as something that your skin and hair aren't super fond of either. For one thing, the chemicals, hormones and antibiotics that are in a lot of dairy products can throw your own hormones off balance and trigger unwanted breakouts. Know what else is a trip? The acidic levels in dairy can damage your hair follicles over time. If your follicles ain't right, your hair can't grow.

2. Fast Food

Fast food might taste good and seem convenient (because you don't have to prepare it and it's relatively cheap). Still, it's not the best thing for your overall health and well-being (check out "Why You Should Consider Leaving Fast Food Alone"). It also sucks at providing good results for your skin and hair. Honestly, I'm thinking that this might be a no-brainer due to all of the sugar and high fats that most fast food contains. Both of those things can lead to acne issues. Also, since fast food oftentimes contains chemicals that can put your hormones on quite a roller coaster ride, that along with how much it lacks in the daily nutrition that your body needs, means that it can affect your hair's growth cycle too. Not in a good way either.

3. Non-Organic Fruits and Veggies

Fresh fruits and veggies are your skin and hair's best friends. No doubt about it. The reason why you should go with the organic ones is because a lot of what you see in the produce section of your favorite grocery store contain pesticides. Pesticides aren't good on a lot of levels yet as it relates to your skin, it can irritate it and also increase signs of aging. The way that pesticides can affect your hair is, because they can weaken your immune system over time, that can ultimately result in hair loss. If you're curious about what fruits and vegetables happen to contain the most pesticides, the Environmental Working Group can help you out if you click here.

4. Swordfish

Swordfish is high in mercury. I'll get why that is problematic in a minute. However, did you know that high fructose corn syrup contains a fair amount of mercury too? Geeze. There are a ton of things that contain it (soda, fruit juice, candy, salad dressing, breakfast cereal, granola bars and energy drinks, for starters), so definitely don't just Kanye shrug this point off.

As if the fact that too much mercury can lead to neurological and behavioral issues (such as anxiety, mood swings, muscle weakness, vision impairment and depression) isn't disturbing enough, it can also stunt your hair's growing phases and it can lighten your skin.

In fact, Allure did an entire article on it entitled, "Dangerous Levels of Mercury Found in Some Skin-Care Products Bought on Amazon and eBay". Check it out when you get a chance.

5. Alcohol

Alcohol has its benefits (check out "Liquors That Are Gluten-Free (& Beneficial In Other Ways)"). Still, everything needs to be done in moderation, right? The reasons why alcohol made this list, though, are multi-faceted. For one thing, it can also trigger inflammation within your system. Also, when it comes to your skin, it can dilate your pores which can not only lead to blackheads and whiteheads but inflamed papules and cystic acne too (whew). And your hair? Well, since it's really no secret that alcohol dehydrates us (and most of us are dehydrated anyway), too much alcohol can leave your hair looking dry and feeling brittle. Who wants that?

6. High-Glycemic Foods

You're probably not gonna be the most thrilled about this one. Sorry for that. Basically, a high-glycemic food is one that quickly raises your blood sugar levels which I'm sure you can guess isn't a good thing. When you eat foods that fall into the low-glycemic category (like fruits, veggies and low-processed foods), it lowers your risk of diabetes and heart disease. It also decreases the risk of your skin getting its collagen levels messed up (due to high-glycemic foods' sugar levels). By "messed up", I mean that high-glycemic foods can lead to a lack of elasticity and youthfulness. As far as your hair goes, it doesn't need high-glycemic foods either because it can increase inflammation, damage your hair follicles and possibly lead to hair loss. And just what foods are considered to be high-glycemic? Basically, the fun stuff—white bread, white pasta, white rice, cake and cookies. By the way, here's what else makes the high-glycemic list that you may not have seen coming. Ready? Watermelon, pineapple and dried fruit. Chile. CHILE.

7. Too Much Vitamin A

When it comes to this particular point, let me first say that Vitamin A is good for your skin and hair on a few levels. Skin-wise, it moisturizes it, boosts your skin's immunity, helps to prevent breakouts and can even speed up the healing process if you've got acne or a cut or wound on your skin. As far as your hair goes, because Vitamin A helps cells to grow. Since, next to bone marrow, hair is the fastest growing tissue in your entire body, I'm pretty sure you can connect the dots there.

Here's the challenge, though. While you've got to basically try and overdo it when it comes to Vitamin A consumption, it is indeed possible. Health-wise, too much of it can lead to headaches, nausea and even comas and death. And when it comes to your skin and hair specifically, too much of Vitamin A can do the opposite of what I just said.

So, how much Vitamin A do you need? Many medical professionals say somewhere around 700 micrograms for us and 900 for men. For us, that breaks down to about 2.5 ounces. This means that if eggs, oranges and dark leafy greens are your thing, enjoy. Just remember that there is such a thing as too much of a good thing.

8. Processed Meat

If you've ever wondered what processed meat actually is, it's meat that has been preserved by the process of curing, salting, smoking, drying or canning. Off top, you know this means that it's got quite a bit of preservatives in it, right? Anyway, meats that would fall into this category include hot dogs, bacon, sausage, salami and smoked meats. Since processed meats contain a lot of sodium, that can lead to puffiness, swelling of the skin and premature aging. Too much sodium can dry your hair out too.

9. Vegetable Oil

I'm someone who likes to cook a lot. Sometimes what I'm preparing requires oil. What I've stayed away from, for years at this point, is vegetable oil. Long story short, the unsaturated fats in vegetable oil, when they are warmed up, they oxidize (lose freshness). As a direct result, the fats not only make your body tissues more vulnerable to harm, the fats can also trigger inflammation which can definitely lead to things like premature aging, wrinkles, sagging and breakouts. By the way, the same thing applies to soybean oil.

Something else to keep in mind about vegetable (and soybean) oil is, because it's an omega-6 kind of oil, that's one more reason why it's not the best thing for you. While on one hand, omega-6 fatty acids can help to relieve symptoms that are related to eczema, psoriasis and even dandruff, too much of it triggers inflammation to your skin and hair follicles too.

So, what kind of oils are better for you? How about trying avocado (it contains monounsaturated and polyunsaturated fatty acids); walnut (it has a good ratio of omega-6 to omega-3 fatty acids); extra virgin olive oil (it's an unrefined oil that's high in antioxidants); peanut (if it's refined, it's high in Vitamin E), and/or flaxseed (it's packed with omega-3s which can actually fight bodily inflammation) oil.

10. Fruit Juice. Kinda.

This says "kinda" because when fruit juice is 100 percent pure and consumed in moderation, it's not a bad thing. The reality, though, is a lot of us don't drink pure juice; we consume that kind that has a ton of sugar in it. How much? A cup, on average, contains a whopping 23 grams. And how much sugar does your body need a day? 24 grams. Exactly.

We've already touched on the fact that too much sugar in your system can wreak total havoc on your skin and hair. It's really easy to drink triple and quadruple the amount of sugar that you need on a daily basis under the guise of "it's just apple or orange juice". Yeah, be careful with that. Too much sugar is never good. Sometimes, the current state of our skin and hair is living proof of this very fact. That's why you should have no more than a glass or two and drink water the rest of the day. Every part of your body, inside and out, will be glad that you did. Your hair and skin included.

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