What happens inside food when heat, water, mixing, fermentation and other cooking processes change its structure.
The round holes in Swiss-style cheese are gas bubbles that became part of the structure. Propionibacterium freudenreichii metabolizes lactate and produces CO₂; when the cheese matrix is elastic enough to hold that gas, the bubbles expand into the openings cheesemakers call eyes.
A very strong smell can be completely normal in ripened cheese. Microbes and enzymes generate volatile aroma molecules, including sulfur compounds that are noticeable at tiny concentrations. The key question is whether the smell fits the cheese style or is a new, abnormal change.
Cheese is made from milk, but it does not keep all of milk’s lactose. Roughly 98% of milk lactose is removed in whey or converted to lactic acid during cheesemaking, and residual lactose is metabolized early in ripening. Many firm aged cheeses therefore end up with very small amounts.
Both are aromatic long-grain rices and share 2-acetyl-1-pyrroline as an important aroma compound. Basmati generally cooks into long, separate grains; jasmine is softer and a little more cohesive. Their basic macronutrient profiles are similar, although some basmati varieties have tested lower on the glycemic index.
Cheese can “sweat” for several reasons. Temperature changes move water through the cheese and can create condensation; warming makes milk fat more fluid; and fresh high-moisture cheeses can release whey. A few clean droplets are a different finding from slime, off odors or unexpected mold.
Intact garlic stores alliin and the enzyme alliinase separately. Cutting or crushing mixes them and rapidly forms thiosulfinates such as allicin. Strong heat inactivates alliinase; experimental studies suggest crushing garlic and allowing about 10 minutes before heating preserves more of this chemistry than heating whole cloves immediately.
Canned sardines with bones are calcium-rich because you eat the fish's skeleton. A USDA-derived reference contains about 382 mg calcium per 100 g; an 85 g serving is roughly 325 mg. Pressure and heat soften the small bones enough to chew, but they do not create new calcium.
A USDA raw tomato reference provides 18 calories, 1.2 g fiber and about 12.7 mg vitamin C per 100 g. Canned tomatoes packed in tomato juice provide about 16 calories, 1.9 g fiber, 2.6 mg vitamin C and 115 mg sodium. Heat can lower vitamin C while making tomato lycopene easier to absorb.
Hard Parmesan contains roughly 35–36 g protein per 100 g, more than ten times the concentration in milk. Aging does not create new protein: curd formation, pressing and months of moisture loss concentrate the casein and other milk solids that remain in the cheese.
During sourdough fermentation, lactic acid bacteria and yeasts transform sugars and produce acids, gases and aroma compounds. The pH falls, flavor and dough structure change, and phytate and some fermentable carbohydrates such as fructans may decrease. The size of those changes is not fixed: flour, microorganisms, temperature, fermentation time and acidity all matter, so not every bread labeled sourdough undergoes the same process.
Most olives picked from the tree are too bitter to enjoy because of oleuropein and other phenolic compounds. Curing is not simply a way to add salt: brine, fermentation, water or alkaline treatments remove or transform much of the bitterness and create a stable table olive. Depending on the style, processing can take from days to many months.
A white or gray film on chocolate is usually bloom: cocoa butter recrystallizes at the surface, or moisture dissolves sugar that later recrystallizes. If the chocolate was stored appropriately and has no mold, off odor, damaged packaging, or other contamination signs, bloom is mainly a quality defect rather than a safety problem.