Full Nutrition Facts (USDA FoodData Central)

Values from USDA FoodData Central. They are representative entries for raw and boiled-drained broccoli; values vary with variety and preparation, and raw vs cooked figures describe different food states.

Boiling can cut vitamin C substantially — in the USDA entries here, the boiled value is about half the raw one — because vitamin C is lost to heat and leaches into the water. Raw and cooked figures are separate food states (water content changes too), so read them as representative values, not a lab retention test.

How Cooking Changes Broccoli Nutrition

In general: less water, less time, more nutrients kept. Brief steaming (3-4 minutes) is the practical sweet spot — bright green and tender-crisp — though exact retention depends on conditions. If you boil, use the cooking water in soups or sauces to reclaim the leached vitamins. Chop broccoli before cooking: cutting lets the myrosinase enzyme start converting glucoraphanin. Letting chopped broccoli stand before a brief cook may help formation — no specific waiting time guarantees a result. (Retention and sulforaphane levels vary with exact time, temperature, and water — treat this table as a guide, not measurements.)

Broccoli vs Cauliflower vs Brussels Sprouts (per 100g raw)

In this comparison, broccoli has the highest listed vitamin C, while Brussels sprouts provide more protein and fiber; cauliflower is the lowest-calorie option. All three are crucifers studied for their plant compounds — rotate them rather than declaring one winner.

Sulforaphane: Broccoli’s Signature Compound

Sulforaphane is a naturally occurring compound studied for its biological effects, including pathways related to inflammation and cancer. Much of the evidence comes from laboratory and animal research; human studies are still investigating. Broccoli contains glucoraphanin, a precursor that the enzyme myrosinase can convert into sulforaphane when the tissue is cut or chewed. Heating reduces myrosinase activity, so raw broccoli and some lightly cooked preparations support this conversion better — the amount varies.

What does the research say? Laboratory and animal studies have investigated sulforaphane’s effects, and human studies are exploring its potential. These findings do not establish that eating broccoli prevents or treats cancer or extends lifespan — broccoli earns its place through its overall nutrient package: fiber, vitamin C, vitamin K, and more. Broccoli sprouts can contain substantially more glucoraphanin (the precursor) than mature heads, though amounts vary with growing conditions.

Practical takeaway: eat some broccoli raw (in salads or with dip), or chop it before cooking and let it stand a while. That habit supports sulforaphane formation for zero extra effort — how much forms varies.

6 Health Benefits

1. Immune support: 89mg of vitamin C per 100g raw. Vitamin C supports normal immune function, and broccoli is an efficient way to cover much of your daily need.

2. Bone health: 102mcg of vitamin K per 100g supports bone mineralization, plus calcium and magnesium.

3. Heart health: Broccoli provides fiber and potassium, nutrients that support cardiovascular health as part of a balanced diet; sulforaphane’s specific heart effects in humans remain under study.

4. Eye health: Lutein and zeaxanthin (carotenoids in broccoli) support eye health.

5. Gut health: Broccoli provides dietary fiber, which gut microbes can ferment — effects vary by person.

6. Anti-inflammatory: Sulforaphane and vitamin C have shown anti-inflammatory activity in lab research — that does not prove the same effect from eating broccoli.

The Downsides (Honest Section)

No food is perfect, and broccoli has real caveats:

• Thyroid: Broccoli and other crucifers contain compounds that can affect iodine use in some circumstances. For most people with adequate iodine intake, normal servings are not generally a concern; very large quantities of raw crucifers, especially with low iodine intake, are a different situation. People with thyroid conditions planning major dietary changes should ask their doctor.
• Blood thinners: Broccoli’s vitamin K can affect how warfarin works. If you take warfarin, keep your vitamin K intake reasonably consistent (not necessarily zero), tell your doctor about big dietary changes, and never adjust your dose on your own.
• Gas and bloating: Broccoli contains fiber and fermentable carbohydrates that can cause gas in some people. Start with small portions if you are not used to crucifers and increase gradually; cooking may improve tolerance, though effects vary.
• Pesticides: Residues vary by crop and testing program. Rinse broccoli thoroughly under running water before use — washing removes dirt and some surface residues, not all of them.

Buying, Storing, and Prepping

• Pick tight, dark-green florets with firm stalks. Yellowing means age and nutrient loss.
• Refrigerate unwashed in a loose bag, lasts 4-5 days. Wash right before use.
• Do not overcook. Bright green = nutrients intact. Olive-drab = you went too far.
• Use the stalks. Peeled and sliced, they are sweet and tender, most of the stalk’s nutrition matches the florets.
• Frozen broccoli is a nutritious, convenient option, frozen close to harvest. Blanching before freezing can reduce some nutrients and enzyme activity, while “fresh” heads lose vitamins in transit — neither is universally better.