Calories in Broccoli

Nutrition Facts per 100g (Raw)

34Calories

2.8gProtein

7gCarbs

0.4gFat

Broccoli Nutrition Analysis: The Ultimate Green Superfood

Broccoli (Brassica oleracea var. italica) stands unequivocally as one of the most nutritionally dense, scientifically researched, and widely recommended vegetables on the planet. Belonging strictly to the cruciferous vegetable family (alongside cabbage, kale, Brussels sprouts, and cauliflower), broccoli offers an astronomical array of vital macronutrients, essential trace minerals, and highly specific disease-fighting phytonutrients—all packaged within an incredibly minimal caloric footprint. A standard 100-gram serving of raw, chopped broccoli contains a staggeringly low 34 calories. Because it is physically large, extremely fibrous, and composed heavily of water, broccoli is universally considered a "high-volume" food. This unique characteristic allows individuals to consume massive, physically satiating portions that completely fill the stomach and aggressively suppress hunger hormones, without causing any significant impact on their daily caloric intake budgets.

Macronutrients: High Fiber and Plant Protein

From a strict macronutrient perspective, broccoli is primarily a deeply complex carbohydrate, but it behaves very uniquely within the human digestive system. A 100-gram raw serving delivers exactly 7 grams of total carbohydrates. Crucially, however, 2.6 grams of those total carbohydrates exist directly as insoluble and soluble dietary fiber. This means the net carbohydrates (the specific carbs that can actually be broken down into glucose and absorbed into the bloodstream) sit remarkably low at just 4.4 grams. This structural fiber acts as a critical biological sweep in the gastrointestinal tract, promoting supreme digestive regularity, heavily feeding the symbiotic bacteria that make up your gut microbiome, and radically slowing down digestion to maintain exceptionally stable blood sugar levels.

Beyond its fantastic fiber content, broccoli contains a surprising and often overlooked amount of plant-based protein for a leafy green vegetable. That same 100-gram serving provides nearly 2.8 grams of protein. While this may not rival the massive density of animal proteins or legumes, it is highly significant for a vegetable. When incorporated daily into a massive, mixed-green salad or heavily roasted alongside nuts and seeds, the cumulative protein content from broccoli can strongly contribute to your overall daily amino acid requirements, particularly for individuals following strict vegan or whole-food plant-based diets.

The Phytonutrient Powerhouse: Sulforaphane and Glucosinolates

What truly elevates broccoli from a simple low-calorie vegetable to a genuine, medically researched superfood is its extreme concentration of highly specific sulfur-containing compounds known scientifically as glucosinolates. When raw broccoli is physically chopped, chewed, or lightly crushed, these glucosinolates come into direct, immediate contact with a specific plant enzyme called myrosinase. This rapid chemical reaction instantly produces Sulforaphane, which is undeniably one of the most potent, extensively studied, naturally occurring therapeutic molecules in modern nutritional science.

Sulforaphane has been heavily researched for its profound anti-inflammatory, antioxidant, and potentially aggressive anti-cancer properties. It works systemically by directly activating the Nrf2 pathway in human cells—essentially flipping biological "switches" that command your own cells to drastically upregulate their internal production of highly protective antioxidant enzymes, while actively accelerating the liver's natural Phase II detoxification processes. To physically maximize sulforaphane production before cooking, nutritional science dictates you should ideally chop your raw broccoli and let it sit undisturbed on the cutting board for 30 to 40 minutes, allowing the myrosinase enzyme sufficient time to complete the chemical conversion.

🔥 How to burn 34 Calories (100g serving)?

Run (6 mph pace): 3 minutes
Cycle (Moderate effort): 5 minutes
Walk (3.5 mph brisk pace): 8 minutes
Jumping Jacks: 4 minutes

Note: Caloric expenditure varies based on age, gender, and current body weight.

Micronutrients: A Factory of Vitamin C and Vitamin K

Beyond phytonutrients, broccoli is a spectacular, overwhelming source of several critically important, foundational vitamins. A single cup of chopped raw broccoli (roughly 91 grams) delivers a staggering 135% of the Recommended Daily Allowance (RDA) of Vitamin C. This powerful, water-soluble vitamin is absolutely mandatory for the biological synthesis of structural collagen (which keeps skin elastic and joints lubricated), maintaining robust immune system function, and drastically enhancing the intestinal absorption of dietary iron.

Even more impressively, that same cup of broccoli provides a massive 116% of your daily requirement for Vitamin K1 (phylloquinone). Vitamin K is an incredibly specialized, fat-soluble vitamin directly responsible for synthesizing the specific biological proteins required for normal, healthy blood clotting mechanisms. Furthermore, Vitamin K works powerfully in direct biological synergy with Vitamin D and dietary calcium to actively facilitate long-term bone mineralization, keeping your skeletal structure dense and heavily resistant to osteoporosis and fractures. Broccoli also supplies an excellent amount of Folate (Vitamin B9), which is essential for healthy cellular division and proper DNA synthesis.

Broccoli and Cardiovascular Defense

Beyond its well-documented cancer-fighting properties, regular broccoli consumption offers profound, highly protective benefits for long-term cardiovascular health. The dense concentration of soluble dietary fiber actively binds directly to circulatory bile acids in your digestive tract, physically dragging them out of the body and severely forcing your liver to rapidly burn through existing LDL ("bad") cholesterol stores to aggressively synthesize new bile. This mechanical process reliably and consistently lowers systemic cholesterol profiles over time.

Additionally, broccoli contains exceptional levels of the trace mineral potassium, which completely functions as a biological vasodilator. Potassium naturally relaxes intense tension within the complex walls of blood vessels, radically improving blood flow velocity and significantly lowering chronically elevated blood pressure. Furthermore, the massive antioxidant payload derived directly from sulforaphane actively prevents the dangerous oxidative damage of circulating LDL cholesterol molecules, heavily disrupting the initial biological stages of arterial plaque formation (atherosclerosis).

The Iron Absorption Maximizer

Broccoli is frequently praised by vegan and vegetarian nutritionists specifically for its highly strategic role in maximizing dietary iron absorption. While broccoli itself does contain moderate amounts of non-heme (plant-based) iron, the human body is notoriously terrible at efficiently absorbing raw non-heme iron from plant sources. The vital key to entirely unlocking this iron is Vitamin C.

Because a single serving of broccoli is absolutely saturated with massive, therapeutic doses of Vitamin C, it acts as its own internal biological catalyst. The ascorbic acid completely binds to the non-heme iron directly within your intestinal tract, aggressively preventing it from firmly attaching to other unabsorbable compounds and actively forcing it into a highly bioavailable chemical state. Strategically combining a massive side of steamed broccoli with an iron-dense lentil stew or black bean chili will astronomically skyrocket the total percentage of iron your body successfully metabolizes, actively preventing chronic anemia and persistent daily fatigue.

Frequently Asked Questions

Is broccoli universally considered a good weight loss food?

Yes, broccoli is almost universally considered one of the single best foods on the planet for sustainable weight loss. At only 34 calories per 100g, while simultaneously offering 2.6g of highly satiating dietary fiber, it possesses an exceptionally low energy density. This unique ratio allows you to consume massive, stomach-stretching, visually satisfying volumes of food without significantly impacting your tightly controlled daily caloric budget. The intense mechanical chewing required for raw or lightly steamed broccoli also actively slows the physical pace of eating, giving your brain sufficient time to successfully register highly critical satiety signals.

How does aggressively cooking broccoli affect its complex nutritional profile?

The specific physical method you choose to cook your broccoli drastically impacts its ultimate nutritional value. Aggressively submerging and boiling broccoli in completely open water is the absolute worst cooking method; the intense heat and water volume can rapidly leach up to 50% of the delicate, water-soluble Vitamin C and drastically denature the crucial myrosinase enzyme required for sulforaphane production. Conversely, light steaming (for 3 to 5 minutes max) is scientifically proven to preserve the absolute highest percentage of intact nutrients, experiencing only a negligible 10-15% loss. High-heat roasting heavily concentrates the flavor and fundamentally improves the texture but does gently degrade some heat-sensitive vitamins, while frequently adding significant invisible calories via excessive cooking oils.

Are the tough broccoli stems actually as structurally nutritious as the dark green florets?

Yes, absolutely. The thick, tough, frequently discarded broccoli stems are exceptionally nutritious and are almost entirely identical to the dark green florets in their overall macronutrient profile. While the darker florets possess a marginally higher concentration of specific antioxidants and phytonutrients due to prolonged sun exposure, the thick stems contain significantly more dense, highly insoluble dietary fiber. To perfectly prepare the stems for consumption, use a sharp vegetable peeler to aggressively strip away the extremely tough, fibrous outer layer, and slice the tender, pale-green interior core into highly palatable, crunchy medallions for stir-fries, slow-cooked soups, or raw snacking.

Can eating raw broccoli disrupt my thyroid function?

For the vast majority of people, no. Like all cruciferous vegetables, raw broccoli contains naturally occurring compounds called goitrogens, which can theoretically interfere with normal thyroid iodine uptake. However, extensive clinical research has demonstrated that you would have to consume truly astronomical, physically impossible amounts of raw broccoli daily to induce hypothyroidism. Furthermore, simply steaming or lightly cooking the broccoli completely deactivates the vast majority of these goitrogenic enzymes, perfectly neutralizing any potential risk.

Does freezing broccoli destroy its cancer-fighting properties?

Unfortunately, yes, the standard commercial blanching and freezing process largely destroys the delicate myrosinase enzyme, completely stopping the natural production of sulforaphane. To magically 'reactivate' frozen broccoli and restore its cancer-fighting potential, nutritional scientists recommend sprinkling a tiny amount of ground mustard seed powder directly over the cooked frozen broccoli right before eating. Mustard seeds belong to the exact same cruciferous family and contain massive amounts of intact myrosinase, which will instantly resume the sulforaphane conversion in your stomach.