Showing posts with label vitamin b12. Show all posts
Showing posts with label vitamin b12. Show all posts

Monday, October 25, 2010

Vegan – a Path to Better Health?

Every vegetarian and vegan I know strongly defends their choice to abstain from eating meat and meat byproducts. And, with good reason, they obviously chose this lifestyle because they believe doing so will improve their health. Here’s the rundown on the pluses and minuses of becoming a vegan:

Benefits:
Higher intake of fiber, folic acid, vitamins C & E, potassium, magnesium and many phytochemicals (plant based healthy compounds).
Less saturated fat and cholesterol (beneficial? For some, possibly)
Vegans tend to be thinner, have lower total cholesterol and lower blood pressure reducing their risk of heart disease.
In general, vegetarians typically have lower rates of cardiovascular disease, obesity, type 2 diabetes and some types of cancer.

Drawbacks:
Vegan diets increase the risk of some nutrient deficiencies including vitamins B-12 and D, calcium, omega 3 fatty acids.
Iron and zinc status may be compromised because of the limited bioavailability of these minerals in a vegan diet (compounds in grains, seeds and legumes as well as some other foods and beverages interfere with the absorption of iron and zinc).

Recommendations
Consume B-12 fortified foods such as rice and soy milk and breakfast cereals (check out the Nutrition Facts panel).

Consume calcium-fortified plant foods such as breakfast cereals, fortified beverages, in addition to natural sources such as green leafy vegetables, tofu and tahini.

Consume vitamin D fortified foods.

Eat omega 3 rich vegetarian foods (which contain the omega 3 fat ALA) including flaxseeds, walnuts, canola oil, soy products, hemp seed beverages. Also, consider taking EPA and DHA supplements or eating foods and consuming beverages fortified with these two omega 3 fatty acids.

Click here for references.

Saturday, August 7, 2010

Vegetarian? Make Sure You Eat these Key Nutrients!

Vegetarianism is a healthy way of life for many. Some research shows vegetarians live longer, are leaner and their diets include more fiber and disease fighting antioxidants. There are four main categories of vegetarians and a fourth one for those who just don’t want to go all the way: Flexitarians. Here’s a brief description of all of these categories in descending order of how completely they follow a vegetarian diet in addition to what nutrients they need to be especially cognizant of consuming:

Flexitarian – a Flexitarian is someone who is a semi-Vegetarian. They choose vegetarian meals the majority of the time but sometimes fit in poultry or turkey. Most Flexitarians avoid red meat completely. Flexitarians are not really considered vegetarians but, their diet still consists mainly of plant-based foods. For more information, check out this book on the Flexitarian diet.


Pesco-vegetarian – this diet includes fish, eggs and dairy but excludes all meat and poultry. The main nutrient of concern for a pesco-vegetarian is iron. However, if you eat fish, opt for oysters and clams for your heme iron (the most well absorbed type of iron).

Lacto-ovo vegetarian – this person excludes meat, fish and poultry but eats eggs and dairy products. With good planning (and by including eggs and dairy) the lacto-over vegetarian can easily meet most of their nutrient needs (though they may fall short on iron, copper and zinc).

Lacto-vegetarian – meat, poultry, fish and eggs are excluded but milk and milk products (butter, cheese, yogurt) are allowed.

Vegan – this is the most strict type of vegetarian. Vegans exclude all animal flesh as well as eggs and dairy.

The top vegetarian sources of commonly missing nutrients:

Iron – vegetarians who avoid fish need about twice the amount of iron as non-vegetarians. Why? Vegetarian source of iron (non-heme iron) are poorly absorbed so you need more. Choose from fortified cereals, instant oatmeal, soybeans, lentils, beans (kidney, navy, lima, pinto), tofu, spinach, and black-eyed peas. Consume your iron rich foods with a source of vitamin C such as tomatoes and citrus fruits to enhance the absorption of non-iron. You can also cook in an iron skillet (add foods rich in vitamin C to your skillet meal).

Iodine – this forgotten nutrient is found in iodized salt. If you avoid salt, eat kelp.

Calcium & Vitamin D – dairy is your best bet. If you avoid dairy, choose calcium and vitamin D fortified soy or rice milk. Vitamin D insufficiency and deficiency is emerging as a huge issue in all people, vegetarian or not.

Vitamin B 12 – is found in animal flesh and animal products. Therefore, vegans are very likely to fall short on this crucial vitamin and should therefore focus on consuming fortified cereals (check for B12) and fortified tofu or, talk to your physician about taking a supplement.

Zinc – is found mostly in some types of seafood and meat. For vegans, opt for fortified breakfast cereals, cashews, almonds, kidney beans and peas.

Copper – sesame seeds, cashews, crimini mushrooms, cooked soybeans, cooked barley, sunflower seeds, cooked tempeh, garbanzo beans, navy beans.

Omega-3 fats – are mainly found in fatty fish. If you avoid fish, opt for walnuts, soybean oil, flaxseeds, hemp seeds, dark green leafy vegetables and canola oil. These contain the omega-3 fatty acid alpha linolenic acid.

In general, the more you cut out of your diet, the more diligent you must be to ensure an adequate nutrient intake. It can be done, though sometimes not through food alone and therefore supplements are necessary. Vegans, in particular, should consider supplementing with a B complex (which includes B12), iodine rich foods, vitamin D and calcium or consider a multivitamin which will help make up for dietary shortfalls.

Tuesday, May 25, 2010

Nutrition Concerns with Gastric Bypass

Today I ran into a lady who had gastric bypass 6 years ago (that part I didn’t know). She’s 50 years old, has osteoporosis in one hip, osteopenia in her back and other hip, she’s anemic and deficient in vitamin D. So I asked her if, after her gastric bypass, her physicians told her about the potential for nutrient deficiencies and emphasized the importance of frequent follow-ups to examine her iron, B12 and vitamin D status as well as her bone density. While I’m used to other people letting me know their doctors don’t give them very in depth follow-up instructions, I figured surgery patients would be more closely monitored. But, I was wrong.

If you have had a gastric bypass, be certain to take your health into your own hands and schedule check-ups. Your body will have a tougher time absorbing iron, calcium, vitamin D and vitamin B12. Nutrient deficiencies are common in gastric bypass because the “bypass” part creates a bypass of part of the small intestine so you don’t absorb as many calories (nor will you absorb certain nutrients from food). Because a lack of B-12 and iron can both cause anemia, leaving you feeling fatigued and crummy and deficiencies in D and calcium can lead to brittle bones, it’s vital to monitor your status frequently, even if you are taking supplements per your physician’s orders.

The more extensive your surgery, the more likely you are to have nutrient deficiencies. Though the weight may come off immediately, you’ll need to resume the eating plan and supplements your physician gave you, for a lifetime. For some, gastric bypass is an absolute lifesaver but, you still need to pay close attention to your overall health even after the weight comes off.

Monday, March 29, 2010

Iron for the Over 65 Crowd

I’ve seen two diametrically opposite personality types in the over 65 crowd. The first type focuses on their aches and pains and believes that age is slowing them down so there’s really no use in trying to figure out why they feel sub-par. People that fall into the second personality type believe they can overcome aches and pains, age doesn’t matter and they are enthusiastic about all that life has to offer. As a dietitian and exercise physiologist, I think everyone will feel better if they are physically active and eat a healthy diet. And oftentimes, elderly people fall short on several nutrients, making their diet, and not necessarily age, the root cause of some of their health issues.

The elderly often take in fewer total calories, protein, vitamins B6 and B12, folic acid, iron and zinc than they need. All of these play critical roles in good health. Iron deficiency anemia, the second most common cause of anemia in the elderly, can make you feel tired, breathless and decrease your ability to focus. Iron deficiency anemia can also decrease immunity leaving you susceptible to infections and illness.

If you feel fatigued or you’re having trouble concentrating, get checked for anemia. There are many causes of anemia in the elderly so your physician will likely run a few different tests to find out what is ailing you. Talk to your physician about all of your symptoms, what medicines (prescription and over the counter) and dietary supplements you are taking. After all, you deserve to feel energetic every day!


References:
Am J Clin Nutr. 2004 Mar;79(3):516-21.
J Nutr Health Aging. 2004;8(1):2-6.
J Am Geriatr Soc 1992;40:489-96.