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Strong Support
correlational
Analysis v2
History

In adults aged 21–75, substituting 30 grams of refined grains per day for red meat, white meat, processed meat, and processed seafood is linked to a 12% higher likelihood of having low vitamin B12...

42
Pro
0
Against

Mechanism

Synthesis from 1 study

How it works

People get vitamin B12 mainly from meat, fish, and other animal foods. When they swap those out for refined grains like white bread or rice, they stop getting enough of this vitamin. Over time, their body runs out of stored B12, and without enough, it can't make healthy blood cells or keep nerves...

Most probable mechanism

In Simple Terms

When people stop eating meat, fish, and other animal foods and replace them with refined grains, they get much less vitamin B12 in their diet. Without enough of this vitamin, the body can't make new red blood cells or keep nerve cells working properly, and the levels in the blood drop over time.

Causal chain
1

Dietary intake of vitamin B12 decreases due to elimination of animal-derived foods that are primary natural sources of the vitamin.

Supported by evidence
which leads to
2

Reduced intake leads to declining serum concentrations of vitamin B12 as hepatic stores are depleted over time.

Supported by evidence
which leads to
3

Low serum vitamin B12 limits cellular uptake via transcobalamin II receptors, impairing its role in DNA synthesis and myelin maintenance.

Supported by evidence

Evidence from Studies

Supporting (1)

42

Community contributions welcome

42

Substituting animal protein foods with plant protein foods influences vitamin B12 and folate statuses in a multiethnic Asian population

Cross-Sectional Study
Human
2025 Oct 13

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

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Source Study

Substituting animal protein foods with plant protein foods influences vitamin B12 and folate statuses in a multiethnic Asian population

Score: 42
DOI: 10.1007/s00394-025-03812-9

Similar Assertions

Replacing 30 grams of white or oily fish daily with plant-based protein sources is linked to a higher likelihood of vitamin B12 deficiency in adults aged 21 to 75.

42
0
84%

Replacing all meat with refined grains may increase the risk of vitamin B12 deficiency more than simply eating less meat, because complete shifts to plant-based diets low in essential nutrients can lead to greater nutrient gaps than partial changes.

42
0
83%

When you eat fish, sheep meat, or chicken, your body absorbs vitamin B12 from them at different rates—fish gives you about 42% of the B12, sheep meat gives you 56% to 89%, and chicken gives you 61% to 66%, so not all meats give you the same amount of this important vitamin.

1
0
76%

Swapping processed meats and seafood for plant-based foods may increase folate levels in the blood, while swapping fish and mixed meats for refined grains or plant proteins may decrease vitamin B12 levels, showing that the nutritional effect depends on which foods are exchanged.

42
0
73%

If you eat twice as much vitamin B12 from food, your blood levels of B12 don’t go up much—your body just doesn’t absorb it very well, especially as you get older.

1
0
71%