Pork, belly, with skin, raw

Pork belly with skin is a primal pork cut that comes from the underside of the pig’s torso, just below the loin and behind the shoulder. It consists of alternating layers of muscle and fat, covered with the pig’s skin (rind). This cut has deep culinary roots across many cultures: in East Asia, it’s prized for grilled and braised preparations like Korean samgyeopsal and Chinese hong shao rou; in Western traditions it forms the basis of bacon after curing and smoking processes. The skin adds texture when crisped and helps protect the meat and fat beneath during slow cooking, enhancing juiciness and flavor. Historically, pork belly was a valuable cut because the balance of fat and lean made it ideal for preservation techniques (e.g., curing) prior to refrigeration. Biologically, pork belly is composed of skeletal muscle fibers interspersed with adipose tissue, providing both succulence and high energy content (~518 kcal/100 g) largely from lipids. Unlike lean cuts such as tenderloin, belly contains significant subcutaneous and intermuscular fat that lends a rich mouthfeel and makes it particularly suitable for slow roasting and braising methods that render its fat into a silky sauce. Its rind contains collagen that breaks down into gelatin during extended cooking, contributing to luxurious texture in dishes like slow‑braised pork belly or confit. Variations of pork belly include skin‑on and skin‑off variants; the former is often used where crackling or crispy rind is desired, while the latter integrates more uniformly with marinades and rubs. In terms of production, pork belly’s composition can vary with breed, diet, and age of the animal, which influence fat distribution and thickness of muscle layers. Globally, consumer preferences differ: East Asian markets favor thicker, fattier bellies, while Western markets may lean toward moderate fat levels for a balance of flavor and perceived health profile. Food science research emphasizes that these quality traits — fat content, muscle length, firmness, and skin thickness — are critical for product grading and market value. As a result, producers tailor animal diets and breeding to meet specific market demands. While the rind adds culinary potential, it also increases the overall calorie and saturated fat content, factors that individuals mindful of heart health may need to consider.

Pork belly’s nutrition profile reveals why it is considered one of the most calorie‑dense cuts of pork. According to USDA data, 100 g of raw pork belly with skin delivers approximately 518 kcal, with fat contributing ~92% of total energy, protein ~8%, and virtually no carbohydrates. Its macronutrient composition makes it an excellent energy source; however, this also means moderation is key for most dietary patterns. Breaking down the fat content, pork belly contains roughly 53 g of total fat per 100 g, including around 19.3 g of saturated fat. Saturated fats are of particular dietary interest because they influence blood lipid profiles. Although some research has nuanced the relationship between saturated fats and heart disease, national dietary guidelines continue to recommend limiting saturated fat intake, especially for individuals at risk of cardiovascular disease. Beyond macronutrients, pork belly supplies a spectrum of micronutrients: iron (~0.52 mg/100 g), zinc (~1.02 mg/100 g), and phosphorus (~108 mg/100 g), all of which play important roles in metabolism and immune function. B‑vitamins are also present: thiamine (B1) supports energy metabolism, niacin (B3) participates in cellular respiration, and vitamin B12 is vital for nerve function and blood formation. Although present in modest quantities compared with leaner pork cuts, these vitamins contribute to daily nutritional needs. Notably, pork belly contains negligible carbohydrate and fiber, making it compatible with low‑carb and ketogenic diets, but less suitable for diets prioritizing fiber intake. Its high fat content also means it has a slow gastric emptying profile, which can enhance satiety but also raises overall calorie intake if consumed in large portions. When compared with similar cuts — such as pork loin or tenderloin — pork belly offers significantly higher fat, more energy per gram, and lower protein per gram. Pork loin, for example, typically contains a higher proportion of lean muscle and less than half the fat, making it more suitable for individuals targeting lean protein. In culinary contexts, pork belly’s high fat makes it ideal for slow braises, confit, and dishes where rendering fat enriches the sauce and texture. However, those seeking lean protein with lower energy density may prefer loin or leg cuts.

Source: USDA FoodData Central (FDC ID: 2727576)