Contents
What it is
Chicken breast is the muscle over the bird's chest. Chickens do not fly, so these muscles get little use; they hold little of the oxygen-storing pigment myoglobin, which is why the meat is white and almost fat-free. The legs, in constant use, are darker and fattier for the opposite reason. Having little fat also means it dries out easily — cooked through it turns chalky fast, which is why brining and gentle low-temperature cooking are so often recommended for it.
The reason chicken breast anchors so many weight-management diets is simple: 31 g of protein for 165 kcal. Roughly 75% of its energy comes from protein.
Protein also burns 20–30% of its own calories during digestion and absorption — the thermic effect of food. That is far above carbohydrate (5–10%) or fat (0–3%), so the same calories leave less behind.
Key benefits
- Nutrition data
Complete protein for maintaining muscle
It contains all nine essential amino acids in ample proportions. Leucine in particular — the switch for muscle protein synthesis — runs around 2.3 g per 100 g.
- Moderate evidence
It keeps you full for longer
A meta-analysis of 49 calorie-matched randomised trials found that right after a protein meal, hunger and desire to eat fell while fullness rose, with ghrelin down and CCK and GLP-1 up. All of that is the acute picture, though: across 19 trials of longer-term intake, the same changes did not appear.[1]
- Nutrition data
Very low in saturated fat
Skinless breast holds under 1 g of saturated fat per 100 g. Diets replacing red meat with chicken breast have shown lower LDL cholesterol.
- Nutrition data
Rich in B vitamins and selenium
100 g covers most of the daily requirement for niacin (B3), which is involved in energy metabolism and antioxidant enzyme function.
How to eat it well
- Cook to 74°C internally and no further. Overcooking is what makes it dry.
- Brine it for 30 minutes and it holds moisture far better.
- Rest it five minutes after cooking so the juices redistribute.
- Serve it with vegetables and whole grains. Raising protein alone leaves out fibre and micronutrients.
- Processed chicken breast products are often high in sodium — check the label.
How to read the grades
Each benefit carries a label showing how far research on people supports it. Grades differ between items even within the same ingredient.
- Nutrition data
- A fact verifiable from food composition databases or health authorities. This is a different kind of statement from a clinical effect.
- Strong evidence
- Consistently confirmed across randomised controlled trials or meta-analyses.
- Moderate evidence
- Human studies exist, but effect sizes are small or results are mixed.
- Early research
- Cell or animal work, or small preliminary studies.
- Not established
- Commonly claimed, but not confirmed in studies on people.
What to watch out for
- Charring over high direct heat generates heterocyclic amines. Moderate heat and marinating reduce their formation.
- If you restrict protein for kidney disease, set your intake with your clinician.
- Pushing protein up without fibre makes constipation likely.
- Keep boards and knives used for raw chicken separate and washed — campylobacter contamination is common.
Nutrition
Per 100 g of cooked, roasted, skinless chicken breast. Heat drives off water, so 100 g of raw breast ends up around 70–75 g cooked, and figures for the raw meat come out lower than this table.
- Calories
- 165 kcal8%
- Protein
- 31 g62%
- Fat
- 3.6 g5%
- Carbohydrates
- 0 g0%
- Vitamin B3
- 13.7 mg86%
- Vitamin B6
- 0.6 mg35%
- Selenium
- 27 µg49%
- Phosphorus
- 228 mg18%
- Potassium
- 256 mg5%
- Zinc
- 0.9 mg8%
Percentages are of the US FDA Daily Value for adults and children 4 and over. National reference intakes differ by sex and age.
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Sources
The databases and health authorities this article's nutrition figures and health statements draw on.
- 1Effect of short- and long-term protein consumption on appetite and appetite-regulating gastrointestinal hormones, a systematic review and meta-analysis of randomized controlled trialsMeta-analysisKohanmoo A, et al. Physiol Behav 2020PMID 32768415
- 2USDA FoodData CentralFood composition database
- 3NIH Office of Dietary SupplementsHealth authority
- 4World Health Organization · Healthy dietHealth authority
