80 %
Vitamin B12 contributes to normal energy-yielding metabolism, to the normal function of the immune system and to the reduction of tiredness and fatigue.
How many calories are in roasted lamb breast?
359kcal
in a 100 g portion
359 kcal per 100 g.
Source: UK CoFID 2021, record 18-114. Checked 5 October 2026.
29.9 gFat
22.4 gProtein
0 gFibre
80 %Daily vitamin B12
What’s in a 100 g portion
About a third of a portion is water, which is why the calories stay low. What is left is mostly fat.
- 29.9 gFat
- 22.4 gProtein
- 45.5 gWater
- 2.2 gMinerals and the rest
Above average for meat
Lamb breast is 359 kcal per 100 g. The 253 meat in this database average 241.
Lamb breast359
Meat average241
Low in sugar and salt
Low sugars and low salt by UK labelling rules, per 100 g.
Sugars, per portion0 g
Salt, per portion0.21 g
Vitamins and minerals in lamb breast
Three of the 23 reach the “high in” level, led by vitamin B12.
None recorded
- Vitamin C
Show all 23 with amounts
Vitamin B120.002 mg, 80 %
Niacin (vitamin B3)9.1 mg, 57 %
Zinc3.7 mg, 37 %
Phosphorus180 mg, 26 %
Pantothenic acid (vitamin B5)1.1 mg, 18 %
Potassium300 mg, 15 %
Riboflavin (vitamin B2)0.18 mg, 13 %
Vitamin B60.16 mg, 11 %
Vitamin D0.0005 mg, 10 %
Iron1.4 mg, 10 %
Chloride67 mg, 8.4 %
Thiamin (vitamin B1)0.09 mg, 8.2 %
Selenium0.004 mg, 7.3 %
Copper0.06 mg, 6 %
Magnesium21 mg, 5.6 %
Biotin0.002 mg, 4 %
Iodine0.006 mg, 4 %
Folate0.005 mg, 2.5 %
Vitamin E0.17 mg, 1.4 %
Vitamin A0.01 mg, 1.3 %
Calcium9 mg, 1.1 %
Manganese0.01 mg, 0.5 %
Vitamin Cnone recorded
Badges use the UK legal thresholds per 100 g: 15 % of the reference intake for “source of”, 30 % for “high in”.
What lamb breast doesn’t give you. And where to find it.
No recorded vitamin C, and only 1.3 % of the vitamin A reference intake and 1.4 % of the vitamin E reference intake per 100 g.
Vitamin C
0mgin lamb breast
Find it inCherries, West Indian2150 % per 100 g
Vitamin A
1.3%in lamb breast, per 100 g
Find it inLiver, calf, fried3152 % per 100 g
Vitamin E
1.4%in lamb breast, per 100 g
Find it inSunflower seeds, toasted326 % per 100 g
100 mgVitamin C, 125 %
0.075 mgSelenium, 136 %
0.00125 mgVitamin D, 25 %
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Made in Cambridgeshire
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Lamb breast against other meat
Lamb breast comes second for vitamin B12 here, just behind meat spread.
0.003mg
0.002mg
0.001mg
0.001mg
0.0007mg
0.0005mg
Meat spread+0.001 mg
Lamb, breast, roasted, lean and fatthis page
Bacon rashers, middle, raw−0.001 mg
Lamb, loin chops, raw, lean and fat−0.001 mg
Scotch eggs, retail−0.0015 mg
All values per 100 g, from the same dataset. Differences are against lamb breast.
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Questions about lamb breast
Four questions chosen by the facts above, so every food answers differently.
How many calories are in a portion of lamb breast?
A typical portion (100 g cooked) gives 359 kcal. Per 100 g the figure is 359 kcal.
Is lamb breast high in vitamin B12?
Yes. Lamb, breast, roasted, lean and fat has 0.002 mg vitamin B12 per 100 g, 80 % of the NRV, above the 30 % threshold for a “high in” claim.
Does roasting change the protein in lamb breast?
Yes. Per 100 g, protein goes from 16.2 g raw to 22.4 g roasted. Part of that is the vitamin or mineral itself changing, part is the change in water content.
How much does trimming the fat change lamb breast?
Trimmed of visible fat the same cut has 273 kcal, 18.5 g fat and 26.7 g protein per 100 g, against 359 kcal, 29.9 g fat and 22.4 g protein untrimmed.
How these numbers were made
Every figure comes from the UK Composition of Foods Integrated Dataset (CoFID), 2021 edition, record 18-114, Lamb, breast, roasted, lean and fat, published by Public Health England under the Open Government Licence v3.0. Main data references: Reviewed 2013. LGC, Nutrient analysis of retail cuts of lamb, 1993-1994. Values are per 100 g of the edible part; a portion is 100 g, 100 g cooked, the usual UK portion for meat. Reference intakes follow Regulation (EU) 1169/2011 Annex XIII as retained in GB law; “source of”, “high in” and “low” follow Regulation (EC) 1924/2006, assessed per 100 g. Function lines are the authorised wording from the GB register of nutrition and health claims, credited to the nutrient. Energy is rounded to the whole kcal and kJ; other amounts to one decimal, or two below 1. A trace is shown as “trace” and never gets a figure or a badge; a nutrient never analysed is left off the page. We start from the dataset’s 2,887 records and keep 2,322: records weighed with bone, shell or skin, alcoholic drinks, infant foods, brand-named products, records with fewer than eight measured vitamins and minerals and near-identical variants are left out. Group context uses the 253 meat kept from the dataset; a rank counts only the foods with a measured figure for that nutrient. Merged variant: trimmed of visible fat (lean only): 273 kcal, 18.5 g fat, 8.6 g saturates, 26.7 g protein. Food images are illustrations from Ingredient Atlas, released under CC0; they show the food, not the measured sample, and where no illustration of the exact food exists the nearest one is shown (here: Lamb Breast). Checked 5 October 2026. Contains public sector information licensed under the Open Government Licence v3.0.
More meat
From the same group, with calories per 100 g, and the foods with the most vitamin B12.
More meat
Most vitamin B12
- Liver, ox, raw0.11 mg
- Liver, ox, stewed0.11 mg
- Liver, lamb, fried0.083 mg
- Liver, calf, raw0.068 mg
- Liver and bacon, fried0.0666 mg
- Liver, calf, fried0.058 mg
- Vitamin B12 guide