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Tragically, many Low Carb dieters actually believe that a Low Carb diet actually decreases inflammation levels. The reasons for this is based on the title of this study: "Comparison of low fat and low carbohydrate diets on circulating fatty acid composition and markers of inflammation."  This study compared a "low fat" diet with a Low Carb Diet and found lower inflammation levels in the latter. However, what is not understood is that this "low fat" diet was actually 25% fat.
Of course, a medium-high carb, medium fat diet can be lethal if done with the wrong carbs and wrong fats and this is just what this study discovered. If you want to go this route, it is better to sick with a Mediterranean Diet as mentioned above, which has done very well in the studies. Remember that researchers call a true Low Fat Diet a "very low fat diet" and a low fat diet to them is actually in the 20-30% range.
Again, nothing beats inflammation like a true low glycemic, whole foods Low Fat Diet when it comes to inflammation and I outline this in my link on Many Benefits of a Low Fat Diet.
3. Insulin Resistance. I always say that all you have to do is watch The Two Big I's and the rest will take care of itself. Almost all chronic disease can be traced back to insulin resistance and inflammation. Well, high fat meals have long been used by researchers to induce insulin resistance in laboratory animals! For example, one study wrote "chronic high-fat feeding in rats induces profound whole-body insulin resistance, mainly due to effects in oxidative skeletal muscle." 
So think of the irony of this: many Low Carbers are consuming high fat diets in order to cure prediabetes or diabetes only to be throwing their body into a nasty state of insulin resistance.
NOTE: The same study above also noted that "prior exercise, a single low-fat meal, or fasting all significantly increased insulin-stimulated glucose utilization."  In other words, exercise, fasting or a Low Fat Diet can all somewhat counteract a High Fat meal. But one can't help but ask the question, why do it in the first place?
4. Endothelial Dysfunction. Low Carbers love to slam high carbohyrdrate meals. What they don't realize is that high fat meals actually increase endothelial dysfunction. Of course, if you've read much on this site, you realize that endothelial dysfunction is virtually synonymous with erectile dysfunction.  Now, admittedly, eating vegetables was found to partially overcome this in the study. But, again, why risk it? The high fat meal was found to reduce the ability of the arteries to expand and platelets were found to clump together more easily, i.e. "sludge".
5. Blood Flow! High fat meals hammer endothelial function, as mentioned above, and correspondingly blood flow. Less nitric oxide, less expandable arteries and less fluid plasma all translate to decreased blood flow. And, yes, erections are all about blood flow, so this will not be good for your sex life. Knowledgeable researchers have known that this is a significant problem with high fat diets and have actually studied ways to try to cirdumvent the issues. For example, one study found that massive doses of Vitamin C helped heart patients retain their endothelial function post-meal.  Yet another study found that exercise can do the same in healthy adults.  And, as I mention elsewhere on the site, walnuts have been found to partially do the same. Doesn't the fact that you have to so diligently protect yourself from the effects of a high fat diet tell you something?
6. CCK Resistance. Researcher discovered that that rats fed a high fat diet developed CCK resistance.  Cholecystokinin, or CCK, is the messenger to the brain which tells the liver to loeert blood sugar output.
7. Cognition and Learning. As I document in my Brain Killers link, many studies have shown that high fat diets are very hard on the brain. Of course, this is not surprising considering that poor blood flow and insulin resistance are very hard on the brain.
8. Cortisol. The last thing a man needs is to increase cortisol and a low carb, high fat diet was found to do just that. 
9. BPH (Prostate Enlargement). As men age, they often struggle with an enlarged prostate and difficulty with urination. What causes this? Well, researchers have recently discovered that one of the key factors is insulin resistance and - you guessed it - a high fat diet is a risk factor because it induces insulin resistance. Check out my link on BPH Prevention for more information.
10. Endotoxemia. Endotoxemia is a condition where harmful chemicals (antigens) released by bacteria in the gut raise inflammation levels in the body. What causes endotoxemia? Researchers found that a single high fat meal raised endotoxin levels by 50% and postulated that "low-grade endotoxemia may contribute to the postprandial inflammatory state and could represent a novel potential contributor to endothelial activation and the development of atherosclerosis."  That's right: high fat could potentially harden your arteries, including the ones in your penis.
Here are some related links for more information:
1) J Am Coll Nutr, 2007 Apr;26(2):163-9, "Low carbohydrate, high fat diet increases C-reactive protein during weight loss"
2) Diabetes, Dec 1997, 46(12):2022-2028, "Diet-Induced Muscle Insulin Resistance in Rats Is Ameliorated by Acute Dietary Lipid Withdrawal or a Single Bout of Exercise: Parallel Relationship Between Insulin Stimulation of Glucose Uptake and Suppression of Long-Chain Fatty Acyl-CoA"
3) Lipids, 2008 Jan,43(1):65-77, Epub 2007 Nov 29, "Comparison of low fat and low carbohydrate diets on circulating fatty acid composition and markers of inflammation"
4) Metabolism: Clinical and Experimental, Nov 2001, 50(11):1351-1355, "Effects of a high-fat diet on postabsorptive and postprandial testosterone responses to a fat-rich meal"
5) Am J Clin Nutr, 2003 Jan, 77(1):139-43, "Effect of dietary antioxidants on postprandial endothelial dysfunction induced by a high-fat meal in healthy subjects"
6) Metabolism, 1990 Sep, 39(9):943-6, "Effects of a fat-containing meal on sex hormones in men"
7) The Journal of Clinical Endocrinology & Metabolism November 1, 2007 vol. 92 no. 11 4480-4484, "Dietary Macronutrient Content Alters Cortisol Metabolism Independently of Body Weight Changes in Obese Men"
8) Cell Metabolism, Aug 6 2009, 10(2):99-109, "Intestinal Cholecystokinin Controls Glucose Production through a Neuronal Network", Grace W.C. Cheung, et. al.
9) Clinical Cardiology, May 2002, 25(5): 219-224, "Vitamin C preserves endothelial function in patients with coronary heart disease after a high-fat meal"
10) European Journal of Applied Physiology, Oct 2006, 98(3):256-262, "The effect of acute exercise on endothelial function following a high-fat meal"
11) Am J Clin Nutr, 2007 Nov, 86(5):1286-92, "A high-fat meal induces low-grade endotoxemia: evidence of a novel mechanism of postprandial inflammation"
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