I’ve done something today that I probably haven’t done for at least a year or more. I bought a beef patty. I felt very guilty because I don’t want to eat large mammals. Ideally I wouldn’t eat any birds or animals, but we have to make practical choices. From my experience, having celiac disease, I don’t absorb vitamins and minerals well. A chicken leg of 100 grams has approximately 6% daily value of cobalamin, 6% DV magnesium, 7% DV potassium, and 25% DV B-6. Without eating meat or fish, you could try to get vitamin B-6 from beans, also fortified cereals contain B-6. Here is the issue – with celiac you cannot eat most fortified cereals and breads since they are not gluten-free, also eating too many beans causes digestive problems. So I had to make a choice and about a year ago I chose to eat seafood and poultry, but not mammals. My reasoning is that compared to chickens and turkeys, large mammals such as pigs and cows have more complex brains and nervous systems and therefore have more complex emotions and might suffer more during their short life in a cage at a factory farm. I have no proof of that, but I had to make a choice.
Unfortunately recently I had to make another choice to start eating red meat again. I was experiencing lethargy and noticed white bands on my nails. Some sources stated that white spots on nails could be a sign of zinc deficiency, while others indicated that there was no correlation. This did lead me to wondering whether I was getting enough zinc, selenium, and B vitamins from chicken and salmon. 100 grams of beef on average contain 43% DV (daily value) of B12, 20% DV of B6. Dietitians of Canada also list beef as top sources of zinc, 75 grams of beef containing 4.0 – 8.6 mg of the mineral (women need 8 mg per day). Chicken is much lower in zinc, 1.3 – 2.2 mg per 75 grams. Salmon was not listed as it is not a good source of zinc, it contains about 0.64 mg per 100 grams. Some studies indicate that it’s harder to absorb zinc from a plant based diet, in addition to that my absorption may be worse due to gut inflammation caused by autoimmune disease.
“With reduced intake of meat and increased intake of phytate-containing legumes and whole grains, movement toward plant-based diets reduces dietary iron and zinc absorption.“
Why do we need zinc and what happens if there is a zinc deficiency? Zinc is found in cells throughout the body and is needed to make proteins and DNA. Zinc plays a role in cell division, cell growth, wound healing, and the breakdown of carbohydrates. It is important for the function of the immune system and also the senses of smell and taste.
Zinc deficiency can cause appetite loss, poor immune system function, diarrhea, eye and skin lesions, feeling lethargic, strange taste sensations, hair loss, weight loss, poor wound healing. Individuals with chronic conditions and poor absorption are more likely to be zinc deficient.
Zinc performs its biochemical functions as a divalent cation (positively charged ion) primarily when bound to enzymes and other proteins. Zinc is essential as a catalytic, structural, and regulatory ion and is involved in homeostasis (the tendency to maintain a stable, relatively constant internal environment), immune responses, oxidative stress, apoptosis (the death of cells which occurs as a normal and controlled part of an organism’s growth or development), and aging. Zinc is recognized as being important for stabilizing DNA and appears to reside in the nucleus longer than any other cell compartment. Therefore, it is possible that as intracellular levels of zinc increase, more iron will be displaced from nucleoproteins and less OH-driven DNA damage will occur.
A study on zinc deficiency in relation to psychiatry:
“Zinc participation is essential for all physiological systems, including neural functioning, where it participates in a myriad of cellular processes. Converging clinical, molecular, and genetic discoveries illuminate key roles for zinc homeostasis in association with clinical depression and psychosis which are not yet well appreciated at the clinical interface. Intracellular deficiency may arise from low circulating zinc levels due to dietary insufficiency, or impaired absorption from aging or medical conditions, including alcoholism. A host of medications commonly administered to psychiatric patients, including anticonvulsants, oral medications for diabetes, hormones, antacids, anti-inflammatories and others also impact zinc absorption. Furthermore, inefficient genetic variants in zinc transporter molecules that transport the ion across cellular membranes impede its action even when circulating zinc concentrations is in the normal range. Well powered clinical studies have shown beneficial effects of supplemental zinc in depression and it important to pursue research using zinc as a potential therapeutic option for psychosis as well. Meta-analyses support the adjunctive use of zinc in major depression and a single study now supports zinc for psychotic symptoms.”
From my own experiment with N=1, I did feel better after eating a beef patty. This could be a coincidence, a placebo effect, or an actual effect of the minerals/vitamins in beef on my mood. I also thought of a substitute for beef that is not a mammal – mussels and clams. A 3-ounce serving of cooked mussels contains about 15% of daily value of zinc. The same amount of moist-cooked clams also provides 15% of the daily value for zinc. Clams and mussels contain high amounts of vitamin B12, selenium, and iron, as well as omega-3 fats. I think therefore it’s possible for me to continue avoiding beef if I include chicken, fish, mussels, and clams.