The Pros and Cons of Veganism

The Pros and Cons of Veganism

Posted on July 22, 2023


Dr Mercola

Story at-a-glance

• Although veganism has some health benefits, it is also loaded with many disadvantages and is unsuitable for many, especially if you have certain genetic polymorphisms predisposing you to poor beta-carotene conversion
  
• People with polymorphisms causing poor conversion of beta-carotene are at high risk for reproductive problems, skin and eye problems and poor dental health
  
• The blood type diet, detailed in “Eat Right 4 Your Type,” often works well for those with blood type O, as those recommendations are consistent with a healthy diet. It typically does not work well for the other blood types
  
• Nutrient cycling (cycling between higher and lower amounts of fat, net carbs and protein) and cycling between high and low calorie intakes (fasting and feasting) appear to be foundational criteria for optimal biological functioning
  
• If you’re on a ketogenic diet, it’s important to cycle high and low amounts of net carbs once your body is able to efficiently burn fat for fuel in order to optimize your metabolism. Cyclical fasting is also recommended
  

Editor’s Note: This article is a reprint. It was originally published July 8, 2018.
Denise Minger is perhaps most noted for her comprehensive rebuttal of “The China Study” some eight years ago. She’s heavily vested in the vegan versus omnivore battle, having cycled through vegetarianism and raw veganism, finally coming full circle to being an omnivore.
Minger took to vegetarianism when she was just 7 years old. “I was eating steak one night at dinner and almost choked on it. I developed some kind of phobia surrounding things with meat textures and went vegetarian overnight,” she explains.

Raw Veganism Took a Toll on Health

However, during the 10 years she remained a vegetarian, she began developing food allergies, including wheat and dairy allergies. “By the time I was a teenager, I was really health-conscious,” she says. “I had to get into that whole scene just to stay healthy.”
At age 15, she discovered the raw vegan movement and got on the 80/10/10 diet, promoted by Dr. Douglas Graham. The diet is based on the hypothesis that we should eat what other primates eat, particularly frugivorous chimpanzees and bonobos.
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As mentioned, Minger produced a very comprehensive critique of “The China Study” which is the scientific justification for many vegan positions. Her analysis — which some suspected to be funded by the meat industry — was actually undertaken while recovering from an accident. At the age of 22, she was hit by a car while riding her bicycle and shattered her elbow. Her convalescence afforded her the time to work on this project.
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The Case for Lowering Protein Intake

For all its drawbacks, there are benefits to veganism. The biggest one, from my perspective, is that vegans have — compared to those who eat the standard American diet — a significantly lower protein intake. I think there are valuable insights that can be drawn from that, which can be integrated into a low-carb paleo approach. Minger agrees, saying:
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This makes sense considering the importance of long-chained omega-3 fats: eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Those who restrict themselves to a plant-based diet are only getting alpha-linolenic acid (ALA) which, while being a precursor for EPA and DHA cannot be converted at significant, therapeutic levels.

Protein Cycling

Clearly, the composition of the animal protein is a significant issue. We don’t want processed foods. We don’t want meat from factory farms that is contaminated with glyphosate (due to contaminated grain feed). But there’s also the issue of the amount. Many are simply eating far too much protein, which (when consumed in excess) activates mTOR, a pathway involved in both aging and cancer. Pulsing higher and lower amounts of protein also seems a wise strategy.
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Macronutrient Cycling — An Overlooked Component

In deconstructing and assessing the low-carb, high-fat approach, Minger concluded the lack of high and low nutrient cycling was one of the main problems, especially long-term, and particularly for women. “I do one-on-one consulting with people,” she says.
“A large group that I have come in contact with are women who’ve done low-carb. Their thyroid function is tanking. They’re gaining weight. They feel terrible. Their hair is falling out. It happens with men too sometimes, but I think women, hormonally, are more sensitive to the lack of carbohydrates.”
She’s also found evidence suggesting chronic lack of carbohydrates may be having an adverse effect on your gut microbiome. In his commentary, “Sorry Low Carbers, Your Microbiome Is Just Not That Into You,”¹ Jeff Leach with the Human Food Project details the likely shifts found in the gut microbiome composition of people who consume low-carbohydrate diets. Whether or not those shifts are wholly detrimental or not is still unknown, but it’s worth keeping an eye on.
Minger is equally ambivalent about long-term, chronic high-fat consumption, as some of the evidence suggests it may increase gut permeability and the transport of endotoxin from gram-negative bacteria into the bloodstream, which increases chronic inflammation and related health problems.
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From my perspective, I think there are compelling reasons to suspect one might run into problems, for many of the reasons Minger cites. It appears nutrient cycling (i.e., cycling between higher and lower amounts of fat, net carbs and protein), and also cycling between high and low calorie intakes (fasting and feasting), are foundational criteria for optimal biological functioning.
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Cyclical Ketogenic Diet Combined With Cyclical Fasting

First of all, the late Dr. Joseph Kraft showed that using sensitive oral glucose loading and testing insulin levels that insulin resistance is pervasive. Based on a more refined definition of insulin resistance, at least 80% of the population have diabetes in situ,^2,3 which means they’re insulin resistant even though their fasting glucose is normal.
This is where low-carb can be really useful, yet it alone will still not be enough for many. A lot of people need to get even more aggressive and do fasting. Once you’ve done that for a while and resolve the insulin resistance, you need to cycle net carbs (total carbs minus fiber) back in.
The converse can also occur. If you suppress insulin for too long, your blood sugar will tend to rise from hepatic gluconeogenesis. If you reintroduce carbohydrates at that point, it will raise insulin and lower your blood sugar. You can also eat too much fat; since fat is high in calories, the excess calories alone can lead to weight gain. As mentioned above, protein intake also needs to be regulated to avoid mTOR activation.
Traditional paleo is frequently high-protein, high-fat, similar to the Atkins approach. But you’re not going to get all the benefits unless you restrict protein. As a general rule, I recommend limiting protein to half a gram per pound of lean body weight, to ensure you’re getting the protein you need for muscle maintenance and repair. The answer is not to cut protein out altogether. You do need some, just not the enormous amounts most Americans are used to eating.

Focus on Nutrient Density

When asked what the best animal food composition might be, Minger stresses the importance of nutrient density over any specific dosage recommendations, as the ideal amount will depend on the type of meat you’re eating. “For my own diet, I focus on organ meats and shellfish,” she says. “Those are the primary foods I eat that are of animal origin. Oysters are my favorite. Nutritionally, if you look at liver and oysters, oysters are kind of like the liver of the ocean.”
People who shun animal foods due to ethical concerns about eating something that is highly sentient can also take heart in the fact that oysters lack the central nervous system “that would make them equivalent to a cow.” “There’s a bivalve vegan movement, where people are vegan with the inclusion of certain shellfish. I think that can go a long way for people to balance out a vegan diet,” she says.
As for cooking, Minger recommends using gentle methods to avoid the creation of carcinogens associated with high-temperature cooking. These byproducts “seem to be driving the correlation between meat consumption and different cancers that we see in observational studies,” she says.
“Whenever you look at a study that actually controls for the cooking method, typically once you take away the high-heat kind of strategies for cooking your meat, the correlations with various diseases start to diminish, if not disappear completely.” Byproducts created during grilling and frying include heterocyclic amines and polyaromatic hydrocarbons that form carcinogens. So, don’t overcook your meat, and balance muscle meat (steaks) with organ meat and other animal parts.
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Via https://articles.mercola.com/sites/articles/archive/2023/07/22/the-china-study-and-other-nutrition-plans.aspx


THANKS TO: https://stuartbramhall.wordpress.com/2023/07/22/the-pros-and-cons-of-veganism/