Liver appears consistently at the top of nutritional tables. That density brings both an advantage and a constraint.
What is the nutritional profile of liver?
A hundred grams of cooked beef liver carries the following.
Energy 175 calories.
Protein 26 grams.
Fat 5 grams.
Iron 6.2 milligrams.
Vitamin B12 70 micrograms.
Vitamin A 9440 micrograms of retinol equivalent.
Copper 14 milligrams.
Folate 253 micrograms.
Riboflavin 3.4 milligrams.
Most of those figures sit many times above the daily requirement, which makes liver both highly valuable and a food to eat with care.
Why is its iron so effective?
The iron in liver is haem iron.
That type occurs in the structure of haemoglobin and myoglobin.
Its absorption runs 15 to 35 percent; the non-haem iron in plant sources absorbs at 2 to 20.
Around 1 to 2 milligrams of the 6.2 milligrams in liver therefore gets absorbed.
Taking the same quantity from lentils requires three times the portion and the absorption still runs lower.
The haem iron in liver also increases the absorption of plant iron in the same meal.
That effect is called the meat factor.
Iron taken from pulses or leafy greens eaten alongside liver gets used better.
| Nutrient (100 g cooked) | Beef liver | Red meat | Lentils |
|---|---|---|---|
| Iron | 6.2 mg | 2.7 mg | 3.3 mg |
| Type of iron | Haem | Haem | Non-haem |
| B12 | 70 mcg | 2.6 mcg | 0 |
| Vitamin A | 9440 mcg | 0 | 0 |
| Protein | 26 g | 26 g | 9 g |
| Folate | 253 mcg | 8 mcg | 181 mcg |
What does the B12 content mean?
That is liver's most striking figure.
An adult needs 2.4 micrograms of B12 a day.
A hundred grams of liver contains 70.
That is around thirty times the daily requirement.
B12 is water-soluble but gets stored in the liver.
The body can hold a reserve of several years.
Excess intake therefore creates no short-term problem.
B12 occurs only in animal sources.
Deficiency is widespread among people eating a plant-based diet; that group needs supplements or fortified products.
Why does vitamin A impose a limit?
That is liver's most important warning.
Vitamin A is fat-soluble and gets stored in the liver.
The excess cannot be excreted and accumulates.
The daily upper limit for adults is 3000 micrograms of retinol equivalent.
A hundred grams of beef liver contains 9440, three times that limit.
Eating it once creates no problem.
But regular, frequent consumption can lead to accumulation.
The signs are headache, dry skin and strain on the liver.
Particular care applies in pregnancy; excess vitamin A can affect development and eating liver is generally not advised during that period.
Which animal's liver is preferred?
The figures vary by animal.
Beef liver is the most widespread and the most balanced.
Lamb liver is softer with a less pronounced flavour; its iron content is similar.
Chicken liver is smaller and softer.
Its vitamin A is lower than beef liver's, at around 3300 micrograms per hundred grams.
That makes chicken liver a more flexible option.
Its iron content is higher too, at 9 milligrams.
Turkey liver carries a similar profile.
Freshness matters; fresh liver is glossy, elastic and neutral in smell. Dull, dry product with a sharp smell should not be bought.
How is it cooked?
Liver is a fast-cooking meat.
Long cooking toughens it and leaves a grainy texture.
The slices should be one to one and a half centimetres thick.
Two or three minutes a side over high heat suffices.
The interior should stay slightly pink.
But it should not stay raw; the internal temperature should reach 70 degrees.
Salt goes on after cooking; added at the start it draws water and toughens the meat.
Soaking in milk or cold water reduces residual blood and the sharp taste.
Thirty minutes suffices, after which it gets dried thoroughly.
Dusting with flour before frying forms a barrier at the surface and reduces the loss of internal juices.
How is a portion of liver set?
That is the most critical information.
A portion of 80 to 100 grams once a week suits adults.
That quantity makes a serious contribution in iron and B12 without creating a risk of vitamin A accumulation.
Where it gets eaten twice a week the portion should fall to 60 or 70 grams.
For children the portion is 40 to 50 grams two or three times a month.
Avoiding it during pregnancy is advised.
Liver alone does not suffice in treating an iron deficiency; a supplement recommended by a doctor is needed.
No source of vitamin C is required alongside liver; haem iron already absorbs well and vitamin C does not markedly affect that type.
How is liver stored?
Liver is among the fastest spoiling meat products.
Fresh liver keeps one day in a fridge.
That is markedly shorter than red meat.
The reasons are high enzyme activity and blood content.
The product should sit on the coldest shelf in a closed container.
A plate should go underneath; leaking liquid can contaminate other foods.
It can be frozen and keeps three months.
It gets divided into portions and wrapped individually.
Thawing happens in a fridge and completes overnight.
Cooked liver keeps two days in a fridge and hardens markedly when reheated.
Slicing it before freezing also helps, since a thin slice thaws in a fraction of the time a whole lobe needs and the texture suffers less.
