
If you live in the United States, you have undoubtedly been bombarded with the miracles of dairy: "milk your diet, lose weight!", "3-A-Day for strong, healthy bones!", and, of course, "Got milk?" Since much of this is endorsed by the government, that means milk must be healthy, right?
Maybe, maybe not. As always, the government typically has an agenda, and this time, that agenda is a pot full of money from the dairy industry. If you are looking for unbiased information, do not look towards the government.
Also, I would advise you to not look towards sites such as notmilk.com or milksucks.com for reliable information either. While I'm sure there may be some truth to what the websites claim, they have an agenda as well.
So, I am going to try to present you with information that is neither biased nor subjective to try to clear up any confusion you may have.
Alright, here we go.
Traditionally, vegans have taken this mentality: Too much protein, especially from animal sources, increases calcium excretion in the urine. Therefore, dairy, a high source of protein, does not protect against osteoporosis but actually contributes to it. Due to the lack of animal protein in our vegan diets, we are protected and thus calcium intake isn't as important for us.
Sounds convincing, right? However, this isn't necessarily true. Let's take a closer look at the whole picture, shall we?
Protein and Calcium Excretion
As
this study suggests, excess protein intake, especially that of sulfur-containing amino acids (which are high in meat products), increases calcium loss in the urine. However, certain proteins actually
increase absorption in the gut, which may or may not counteract the loss in the urine. Also, although low protein diets exhibit less calcium excretion via urine, they have been shown to limit calcium absorption in the intestinal tract. As of right now, evidence is mixed as to whether it is more beneficial to have a higher or lower protein diet in regards to calcium.
Vegans and bone strength
In 2007 EPIC and Oxford releases a study that was conducted with 57,000 participants, 1,000 of which were vegans, over a span of 7 years from 1993 to 2000. Over the years, questionnaires were sent out to measure what the participants were eating and if they had suffered from any bone fractures. At the end of the study, only adjusting for age, vegans had a 37% higher fracture rate than their meat-eating counterparts. When age, smoking, alcohol consumption, body mass, physical activity, marital status and hormone replacement therapy were taken into account, vegans still had a 30% higher fracture rate.
However, when calcium intake was considered, vegans no longer had a higher fracture rate. In the subjects who consumed at least 525 mg of calcium a day (55% of vegans compared with 95% of the other participants), similar fracture rates were seen from all groups.
Do not fall for the misconception that a diet free of meat and other animal products automatically means calcium is no longer a concern for you.
Next, osteoporosis: what is it?
According to niams.nih.gov: "Osteoporosis, or porous bone, is a disease characterized by low bone mass and structural deterioration of bone tissue, leading to bone fragility and an increased risk of fractures of the hip, spine, and wrist." Your risk of developing this bone disease increases if you are: a woman, older, small and thin-boned, Caucasian or Asian, have amenorrhea, low estrogen in women, low testosterone in men, a lifetime low intake of calcium and vitamin D, a smoker, or have excessive alcohol intake.
Prevention steps include meeting one's recommended daily value of calcium
and vitamin D, and doing weight-bearing exercises (this forces your bones to work against gravity and thus helps to increase bone density) .
Vitamin D
When thinking about bone health, vitamin D is often forgotten, and in fact, it is
estimated that more than 80 percent of Americans have some degree of a vitamin D deficiency.
Vitamin D absolutely should not be overlooked. This vitamin is critical for bone health, and without it, bones can become thin, brittle, soft, or misshapen. A lack of vitamin D also causes rickets in children and skeletal diseases in adults. The major biological functions of vitamin D are to maintain normal blood levels of calcium and phosphorus, aid in the absorption of calcium, and to maintain strong bones. (
source)
From veganhealth.org:
"A 2003 report from the Nurses Health Study showed vitamin D to be more important than calcium intake for preventing hip fractures in postmenopausal women.5 In 2007, a meta-analysis of prospective studies and randomized controlled trials found that calcium intake and calcium supplements were not associated with a lower risk for hip fractures."
Requirements and Sources of Vitamin D and Calcium
To meet your RDV of vitamin D (400 IU for 69 and younger, 600 IU for 70 and older), expose un-sunscreened hands, face, and arms to the sun three to four times a week for ten to fifteen minutes a day between 8 a.m. and 4 p.m. Other sources include multivitamins (look for D2, D3 is not vegan) and fortified foods.
As for calcium, amounts vary according to age.
From this
site:
Ages mg/day
14-18 1300
19-30 1000
31-50 1000
51-70 1200
70 + 1200
Pregnant or lactating
14-18 1300
19-50 1000
Good sources include non-dairy milks, tofu (make sure it is made with calcium sulfate), leafy greed vegetables (kale, collards), broccoli, fortified orange juice, beans, blackstrap molasses, sesame seeds, and almonds.
Although spinach, swiss chard, and beet greens have calcium, it is not well absorbed due to their high content of oxalates, which bind calcium.