Vitamin D

Vegan Diets are Dangerous? Here is What the Research Really Says

Messina Plant PlateDoctors at the Cleveland Clinic suggest that vegans should know something about diet planning in order to make sure they are meeting nutrient needs.

Their conclusions were published in the Journal of the American Osteopathic Association. The paper doesn’t say anything that is particularly alarming, and, with a few exceptions, there isn’t much in it that I would take issue with.

But the Cleveland Clinic press-released the findings, giving the media a chance to scaremonger about vegan diets—and you know how much they like to do that.

As is often the […]

By |2016-03-19T11:49:20+00:00March 19th, 2016|Tags: , , , , , , , , |14 Comments

Soyfoods, Olive Oil, Beans, and Omega-3s: A Vegan Plan for Reducing Depression

tofu veggiesSome ex-vegans say that they became depressed on a plant-based diet. If they did, it was probably due to poor food choices and maybe a lack of recommended supplements. It’s doubtful that a healthy vegan diet promotes depression. In fact, eating more plant foods may have a few advantages for people who suffer from this chronic illness.

Is it possible, though, that vegans are more likely to suffer from depression for a completely different reason?

One small study suggests that vegans and vegetarians respond with more empathy (as measured by brain scans) […]

Vegan Diets to Reduce Colon Cancer Risk

GrünkohlThe latest findings from the Adventist Health Study-2 (AHS-2) found that people who ate plant-based diets—which included vegans, lacto-ovo vegetarians and pesco-vegetarians—had a 22% lower risk of colorectal cancer (1).

But when the researchers pulled the subjects apart into more specific groups, the only group of “vegetarians” with a lower risk were the ones who ate fish. Their risk was 43% lower than the omnivores in this study. While vegans and lacto-ovo vegetarians also had a lower risk for colon cancer, these findings weren’t statistically significant.

The only other large scale study to […]

By |2015-04-01T12:18:10+00:00April 1st, 2015|Tags: , , , |3 Comments

Staying Strong on a Vegan Diet: Protein and Muscles

We all know that it’s easy to meet the protein RDA on a vegan diet. But what constitutes “enough protein” remains a topic of some debate among experts.

Among its other functions, protein protects bone health which may in part be due to its effects on muscle mass. Unfortunately, a decline in muscle mass over the years is more common than not. It’s driven to some extent by hormones, but diet and lifestyle clearly have an impact on this, too.

Although weight-training is the most important way to build and preserve muscle, it gets a little bit harder to bulk up as […]

Ten Tips for Staying Happy and Healthy on a Vegan Diet

There is a long list of reasons why people fail on a vegan diet and return to the world of cheese sandwiches and fish fillets. They might have developed overt deficiencies or vague symptoms of poor health. Some ex-vegans say that they experienced depression or foggy thinking or fatigue without animal foods. Others struggled with challenging social situations or with cravings for animal foods.

The following ideas for staying happy and healthy on a vegan diet are all things I’ve written about before, but I wanted to condense them into a sort […]

Vitamin D Supplements Are Still Important for Some Vegans

The U.S. Preventive Services Task Force (USPSTF) is recommending that healthy postmenopausal women avoid low-dose supplements of vitamin D (up to 400 IU) or calcium (up to 1,000 milligrams) because evidence is lacking for a protective effect and there may be a small increase in risk of kidney stones.

It’s not really clear whether these supplemental doses are too low to have an effect (the evidence was lacking for a recommendation regarding higher doses) or whether it’s just that supplements are unnecessary if your diet already provides enough of these nutrients. The preliminary draft report makes no mention of […]

By |2012-06-15T11:56:14+00:00June 15th, 2012|Tags: , , |9 Comments

The New York Times, Nina Planck, and Safety of Vegan Diets

Last week brought more shoddy coverage of vegan diets from The New York Times. This time, it was a debate about the safety of veganism. And it didn’t occur to the Times to solicit opinions from anyone with actual expertise in vegan nutrition.

At the center of the discussion was food writer and farmer’s market expert Nina Planck, who excels at making sweeping, unsupported observations about nutrition. She is woefully uninformed and spectacularly unconcerned about her lack of knowledge and credentials.

Planck believes that we have “extraordinary needs for nutrients not found in plants,” –including vitamins A and D, omega-3 […]

By |2012-04-23T11:50:44+00:00April 23rd, 2012|Tags: , , , , , , , |65 Comments

Vitamins B12 and D: Monitoring versus Supplementing

Good nutrition is aimed at preventing nutrient deficiencies (among other things), which means that, no matter what type of diet you eat, there are circumstances where supplements may play a role. Regular vitamin B12 supplements are absolutely essential for all vegans who don’t eat B12-fortified foods every day. Depending on sun exposure, vegans may also require vitamin D (although this isn’t a vegan issue; it’s true of most omnivores, too.) And depending on individual requirements and diet, some vegans (and again, some omnivores) might require other supplements to ensure adequate intake.

An alternative to supplementing is to monitor blood levels of […]

By |2011-09-12T10:09:28+00:00September 12th, 2011|Tags: , , |46 Comments

Fat Soluble Vitamins: Do They Stand Between Vegans and Health?

This month, I’m working on a couple of responses to recently published criticisms of vegan diets. Among the issues that are frequently raised is one that focuses on fat-soluble vitamins. Some of the concerns are based on legitimate questions about active forms of these vitamins and their absorption from plant foods, and others aren’t. Regardless of those questions, though, plant foods can and do provide enough of the fat soluble vitamins A, D and K. (Vitamin E, which is also fat-soluble, is not involved in the controversy since it’s found in a […]

By |2011-06-20T12:33:48+00:00June 20th, 2011|Tags: , , , , |59 Comments

New Vitamin D and Calcium RDAs: What They Mean for Vegans

The latest recommendations from the Institute of Medicine have many people asking if they should toss out their bottles of calcium and vitamin D supplements. The answer to that question is probably a little bit different for vegans.

The IOM’s report was surprising in that they recommended an intake of vitamin D that was considerably  less than what was expected and suggested that calcium supplements were not needed by most Americans and could even be dangerous. […]

By |2010-12-10T11:54:47+00:00December 10th, 2010|Tags: , |26 Comments