The Lifecycle of Coffee..From Tree to Cup
The coffee tree, belonging to the Coffea genus, thrives in tropical climates between the Tropics of Cancer and Capricorn. Notable species include Coffea arabica (Arabicas) and Coffea canephora (Robustas). Arabica, characterized by large bushy growth, produces cherries with two flat seeds, commonly known as coffee beans. In contrast, Robusta, a robust shrub or small tree, yields smaller oval seeds and is resilient in hotter climates.
Temperature and altitude play crucial roles, with Arabica thriving in 15 to 24ºC conditions and Robusta excelling in 24 to 30ºC temperatures. Rainfall requirements range from 1,500 to 3,000 mm annually, with Arabica being less demanding. While Robusta can grow up to 800 meters above sea level, Arabica thrives at higher altitudes, often cultivated in hilly terrains.
Harvesting the Beans
Hand-picking is the norm for harvesting ripe coffee cherries due to the mountainous landscapes, except in Brazil where machinery finds utility. Pickers, every 8 to 10 days, meticulously select only fully ripe cherries. Arabica’s selective picking, though labor-intensive, is favored for its quality. Harvested cherries yield 2 to 4 kilos, and a skilled picker can harvest 45 to 90 kilos per day, resulting in 9 to 18 kilos of coffee beans.
Processing the Harvest
Post-harvest, the next step involves separating the coffee seeds from the cherries and drying them. Two methods prevail: the dry or ‘natural’ method and the wet method. The dry method, simpler and older, dries whole cherries in the sun for up to four weeks before further processing. The wet method involves pulping, fermenting, washing, and then drying the beans, which takes 8 to 10 days.
Roasting and Grinding
With over 1,000 aroma components identified, roasting conditions determine the final coffee flavor. Green coffee beans undergo roasting at 180ºC to 240ºC for 1.5 to 20 minutes, influencing color and aroma intensity. Roasting occurs in rotating drums or fluidized bed roast chambers, followed by cooling and potential packaging as whole beans.
Brewing and Consumption
Arabica dominates global coffee cultivation, spanning Latin America, Central and East Africa, India, and Indonesia. Robusta thrives in West and Central Africa, Southeast Asia, and Brazil. Different brewing methods, such as filter, plunger, espresso, Swedish, and Turkish, cater to diverse preferences. Instant coffee, made from roasted and ground beans, utilizes either spray-drying or freeze-drying methods.
Understanding Coffee Composition
Caffeine, antioxidants, and diterpenes contribute to coffee’s unique flavor and physiological effects. Caffeine, a mild stimulant, has desirable effects in moderation. Antioxidants, including chlorogenic acids, offer potential health benefits. Diterpenes, like cafestol and kahweol, present in oil, impact cholesterol levels, with brewing methods influencing their concentration.
Exploring Health Considerations
Coffee composition also involves compounds like Ochratoxin A, acrylamide, and furan, which require careful monitoring and adherence to safety regulations. Nutritionally, black coffee is low in macronutrients, providing only 1-2 kcal per 100 ml. Micronutrients like potassium, magnesium, and niacin vary based on preparation methods.
Coffee and Hydration
Black coffee, comprising over 95% water, does not lead to dehydration when consumed in moderation. Studies suggest that caffeine’s diuretic effects are outweighed by the fluid intake from coffee. Moderation, encompassing 3-5 cups per day, aligns with a balanced diet and active lifestyle, providing an enjoyable journey from tree to cup.
