Low Vitamin B12 causes fatigue, weakness, anemia, and neurological issues like numbness, tingling, balance problems, memory loss, confusion, and depression, as it impairs red blood cell production and nerve function, potentially leading to serious, lasting nerve damage if untreated. Symptoms develop gradually and affect energy, mood, and cognitive function, requiring diagnosis and treatment (supplements/diet) to prevent severe complications.
Key points about vitamin B12 deficiency anemia
Without enough red blood cells, your tissues and organs don't get enough oxygen. Without enough oxygen, your body can't work as well. Symptoms include weak muscles, numbness, trouble walking, nausea, weight loss, irritability, fatigue, and increased heart rate.
Taking doses of vitamin B-12 might cause: Headache. Nausea. Diarrhea.
Intramuscular hydroxocobalamin and oral cyanocobalamin are treatment options for the management of clinically relevant vitamin B12 deficiency during pregnancy.
Infants born to vitamin B-12-deficient women may be at increased risk of neural tube closure defects, and maternal vitamin B-12 insufficiency (<200 pmol/L) can impair infant growth, psychomotor function, and brain development, which may be irreversible. However, the underlying causal mechanisms are unknown.
During pregnancy, ensuring adequate vitamin B12 levels is crucial for fetal development and maternal health. The third trimester is especially significant as the fetus undergoes rapid growth and development, necessitating adequate nutrient transfer from the mother.
If you have vitamin B12–deficiency anemia, you may have the typical symptoms of anemia at first, such as fatigue, paleness, shortness of breath, headaches, or dizziness. If left untreated, you may start to notice brain and nervous system symptoms.
Vitamin B12 Deficiency Has Nothing To Do With Weight Gain
There is very little evidence to suggest that vitamin B12 affects the process of gaining or losing weight, despite the numerous techniques involved. Most of the evidence supporting this claim comes from a few observational studies.
The foods highest in Vitamin B12 are animal products, with clams and liver (beef, lamb) being exceptionally rich sources, often providing several hundred percent of the daily value in a single serving, alongside seafood like mussels, sardines, and salmon, dairy, eggs, and fortified cereals and nutritional yeast for vegans.
B12 deficiency can trigger specific food cravings, most notably for meat, fish, or eggs, as the body seeks animal-based sources to replenish the vitamin, especially in those on vegetarian/vegan diets or older adults. While cravings for sugary or salty foods can also signal general B-vitamin issues, the distinct urge for protein-rich animal products is a key indicator, but professional testing is crucial for confirmation.
For the patients with a very low serum B12 level (<100ng/l) and anaemia, macrocytosis or neurological symptoms, the treatment is simple: load the patient with vitamin B12 parenterally (by IM injection) and continue with maintenance vitamin B12 by IM injection every 3 months indefinitely (see below for more details).
Disturbed or blurred vision can also occur as a result of a Vitamin B12 deficiency.
Milk. One of the best drinks with B12 is milk. One cup of whole milk contains approximately 1.32µg of vitamin B12.
Apples and bananas help improve gut health, supporting better B12 absorption. Some fortified fruit juices (like orange juice) may include added B12.
Research shows that low B12 could influence fat metabolism because a lack of B12 may hinder your body's ability to burn fat effectively, potentially leading to weight gain.
The worst symptoms of B12 deficiency involve severe neurological damage, including severe memory loss, confusion, dementia, psychosis, hallucinations, balance problems, trouble walking, and irreversible nerve damage (neuropathy), alongside serious mental health issues like severe depression or irritability, with physical signs including extreme fatigue, pale skin, and a sore, smooth tongue. These severe cognitive and neurological issues are the most concerning because they can become permanent if left untreated.
In conclusion, our results show that lower vitamin B12 was associated with insomnia symptoms and sleepiness in specific groups of participants. However, further research with objective measurements of sleep is crucial to assess the relationship between sleep and vitamin B12.
Stage 1 is decreased levels of vitamin B12 in the blood. Stage 2 is low concentration of vitamin B12 in the cell and metabolic abnormalities. Stage 3 is increased levels of homocysteine and MMA and decreased DNA synthesis resulting in neuropsychiatric symptoms. Stage 4 is macrocytic anemia.
Not diet-related
If your vitamin B12 deficiency is not caused by a lack of vitamin B12 in your diet, you'll usually need to have an injection of hydroxocobalamin every 2 to 3 months for the rest of your life.
Dietary folate, vitamin B6, and vitamin B12 were significantly associated negatively with hypertension, indicating that these nutrients might have a protective effect against hypertension in United States adults.
Values of less than 160 pg/mL (118 pmol/L) are a possible sign of a vitamin B12 deficiency. People with this degree of deficiency are likely to have or develop symptoms. Deficiency should be confirmed by checking the level of a substance in the blood called methylmalonic acid.
Vitamin B12 doesn't directly cure plantar fasciitis, but a deficiency can worsen symptoms or mimic it by causing nerve issues (neuropathy) and weakening tissues, while supplementing may help if you're deficient by improving nerve health and healing, though the primary treatment remains stretching, orthotics, and rest to address the mechanical stress.
The foods highest in Vitamin B12 are animal products, with clams and liver (beef, lamb) being exceptionally rich sources, often providing several hundred percent of the daily value in a single serving, alongside seafood like mussels, sardines, and salmon, dairy, eggs, and fortified cereals and nutritional yeast for vegans.