84% of Vegetarians and Vegans Return to Meat. Why? | Psychology Today
Here are their problems as to why they usually quit:
Vegans are deficit in b12:
Neuropsychiatric Disturbances in Presumed Late-Onset Cobalamin C Disease | Neurology | JAMA Neurology | JAMA Network
German vegan study: diet, life-style factors, and cardiovascular risk profile. - PubMed - NCBI
High fiber diets reduce serum half life of vitamin D3:
Reduced plasma half-life of radio-labelled 25-hydroxyvitamin D3 in subjects receiving a high-fibre diet. - PubMed - NCBI
Vegans have weaker bones due to lower calcium intake and vitamin D3 levels:
Low Bone Mass in Subjects on a Long-term Raw Vegetarian Diet | Geriatrics | JAMA Internal Medicine | JAMA Network
The influence of vegan diet on bone mineral density and biochemical bone turnover markers. - PubMed - NCBI
Vegans have a worse memory compared to non vegans due to creatine deficiency in vegans:
The influence of creatine supplementation on the cognitive functioning of vegetarians and omnivores. - PubMed - NCBI
Oral creatine monohydrate supplementation improves brain performance: a double-blind, placebo-controlled, cross-over trial. - PubMed - NCBI
Vegans have less gains compared to non vegans:
The American Journal of Clinical Nutrition | Oxford Academic
Vegans are deficient in omega threes:
Long-chain n-3 polyunsaturated fatty acids in plasma in British meat-eating, vegetarian, and vegan men. - PubMed - NCBI
Conversion of alpha-linolenic acid to longer-chain polyunsaturated fatty acids in human adults. - PubMed - NCBI
Conversion of alpha-linolenic acid to eicosapentaenoic, docosapentaenoic and docosahexaenoic acids in young women. - PubMed - NCBI
Eicosapentaenoic and docosapentaenoic acids are the principal products of alpha-linolenic acid metabolism in young men*. - PubMed - NCBI
Vegans are deficit in carnitine:
Vegetarians have a reduced skeletal muscle carnitine transport capacity. - PubMed - NCBI
Carnitine status of lactoovovegetarians and strict vegetarian adults and children. - PubMed - NCBI
Systemic carnitine deficiency exacerbated by a strict vegetarian diet.
Correlation of carnitine levels to methionine and lysine intake. - PubMed - NCBI
Vegans are deficient in taurine:
Plasma and urine taurine levels in vegans. - PubMed - NCBI
Vegans are deficient in iodine:
Iodine deficiency in vegetarians and vegans. - PubMed - NCBI
Iodine status and thyroid function of Boston-area vegetarians and vegans. - PubMed - NCBI
Vegans are deficient in Coenzyme Q10:
Effect on absorption and oxidative stress of different oral Coenzyme Q10 dosages and intake strategy in healthy men. - PubMed - NCBI
Vegans are deficient in iron due to the fact that iron from plant sources is less bioavailable than iron from meat sources:
Iron Health Professional Fact Sheet
Dietary reference intakes: vitamin A, vitamin K, arsenic, boron, chromium, copper, iodine, iron, manganese, molybdenum, nickel, silicon, vanadium, ... - PubMed - NCBI
Vegans are deficient in vitamin A:
Two common single nucleotide polymorphisms in the gene encoding beta-carotene 15,15'-monoxygenase alter beta-carotene metabolism in female volunteers. - PubMed - NCBI
The Journal of Nutrition | Oxford Academic
Vegans have a lower sperm count than non vegans:
Some observations on human semen analysis. - PubMed - NCBI
The Role of Soy in Vegetarian Diets
Vegans have lower testosterone than non vegans:
Serum sex hormones and endurance performance after a lacto-ovo vegetarian and a mixed diet. - PubMed - NCBI
The American Journal of Clinical Nutrition | Oxford Academic
Effect of a vegetarian diet and dexamethasone on plasma prolactin, testosterone and dehydroepiandrosterone in men and women. - PubMed - NCBI
http://m.jap.physiology.org/content/82/1/49
Veganism causes loss of libido and erectile dysfunction:
Hypogonadism and erectile dysfunction associated with soy product consumption. - PubMed - NCBI
Children who are raised on strict vegan diets do not grow normally:
Food consumption and height/weight status of Dutch preschool children on alternative diets. - PubMed - NCBI
Effects of macrobiotic diets on linear growth in infants and children until 10 years of age. - PubMed - NCBI
Children develop rickets after prolonged periods of strict vegetarian diets:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1874810/pdf/canmedaj01383-0052.pdf
"There are some links between vegetarians and lower birthweight and earlier labour"
Good nutrition for the vegetarian mother. - PubMed - NCBI
Effects of vitamin B12 and folate deficiency on brain development in children:
Effects of vitamin B12 and folate deficiency on brain development in children
"Particular attention should be paid to adequate protein intake and sources of essential fatty acids, iron, zinc, calcium, and vitamins B12 and D. Supplementation may be required in cases of strict vegetarian diets with no intake of any animal products."
Vegetarian diets in children and adolescents
These next five are case studies:
Cerebral atrophy in a vitamin B12-deficient infant of a vegetarian mother:
Cerebral atrophy in a vitamin B12-deficient infant of a vegetarian mother. - PubMed - NCBI
Severe megaloblastic anemia in child breast fed by a vegetarian mother:
[Severe megaloblastic anemia in child breast fed by a vegetarian mother]. - PubMed - NCBI
Consequences of exclusive breast-feeding in vegan mother newborn - case report:
[Consequences of exclusive breast-feeding in vegan mother newborn--case report]. - PubMed - NCBI
Nutritional vitamin B12 deficiency in a breast-fed infant of a vegan-diet mother:
Nutritional vitamin B12 deficiency in a breast-fed infant of a vegan-diet mother. - PubMed - NCBI
"We report the case of a 7 month-old girl that presented with acute anemia, generalized muscular hypotonia and failure to thrive. Laboratory evaluation revealed cobalamin deficiency, due to a vegan diet of the mother."
[Floppy baby with macrocytic anemia and vegan mother]. - PubMed - NCBI
Most recent studies using more sensitive techniques for detecting B12 deficiency have found that 68% of vegetarians and 83% of vegans are B12 deficient, compared to just 5% of omnivores.
Vitamin B-12 status, particularly holotranscobalamin II and methylmalonic acid concentrations, and hyperhomocysteinemia in vegetarians. - PubMed - NCBI
Signs of impaired cognitive function in adolescents with marginal cobalamin status. - PubMed - NCBI
Pseudovitamin B(12) is the predominant cobamide of an algal health food, spirulina tablets. - PubMed - NCBI
On paper, calcium intake is similar in vegetarians and omnivores (probably because both eat dairy products), but is much lower in vegans, who are often deficient.
Nutrition concerns and health effects of vegetarian diets. - PubMed - NCBI
Choices for achieving adequate dietary calcium with a vegetarian diet | The American Journal of Clinical Nutrition | Oxford Academic
Vegetarians and omnivores have similar levels of serum iron, but levels of ferritin—the long-term storage form of iron—are lower in vegetarians than in omnivores.
Is iron and zinc nutrition a concern for vegetarian infants and young children in industrialized countries? - PubMed - NCBI
This is significant, because ferritin depletion is the first stage of iron deficiency. Moreover, although vegetarians often have similar iron intakes to omnivores on paper, it is more common for vegetarians (and particularly vegans) to be iron deficient. For example, this study of 75 vegan women in Germany found that 40% of them were iron deficient, despite average iron intakes that were above the recommended daily allowance.
Dietary iron intake and iron status of German female vegans: results of the German vegan study. - PubMed - NCBI
Bioavailability of iron, zinc, and other trace minerals from vegetarian diets | The American Journal of Clinical Nutrition | Oxford Academic
many plant foods that contain zinc also contain phytate, which inhibits zinc absorption. Vegetarian diets tend to reduce zinc absorption by about 35% compared with omniovorous diet.
Bioavailability of iron, zinc, and other trace minerals from vegetarian diets | The American Journal of Clinical Nutrition | Oxford Academic
Thus, even when the diet meets or exceeds the RDA for zinc, deficiency may still occur. One study suggested that vegetarians may require up to 50% more zinc than omnivores for this reason.
Bioavailability of iron, zinc, and other trace minerals from vegetarian diets | The American Journal of Clinical Nutrition | Oxford Academic
Soy decreases your testosterone
Soy protein isolates of varying isoflavone content exert minor effects on serum reproductive hormones in healthy young men. - PubMed - NCBI
PubMed Journals will be shut down | NCBI Insights
Why you need dietary cholesterol:
Very great total picture kind of lecture:
David Diamond - An Update on Demonization and Deception in Research on Saturated Fat... - YouTube
Eating meat increases testosterone
Effects of replacing meat with soyabean in the diet on sex hormone concentrations in healthy adult males. - PubMed - NCBI
Saturated Fat Finally Vindicated in Long Buried Study
Saturated Fats Provide Many Important Health Benefits
Medium Chain Triglyceride Oil Consumption as Part of a Weight Loss Diet Does Not Lead to an Adverse Metabolic Profile When Compared to Olive Oil
Medium Chain Triglyceride Oil Consumption as Part of a Weight Loss Diet Does Not Lead to an Adverse Metabolic Profile When Compared to Olive Oil
Why you need cholesterol for testosterone
http://www.livestrong.com/article/435773-cholesterol-testosterone/
>Very wide and diverse amounts of similar research and current scientific consensus (look at the links at the bottom)
Will eating eggs increase my cholesterol? | Examine.com