Clear explanations of nutrition concepts such as protein, fiber, glycemic response, energy density and nutrient quality.
When cooked potatoes cool, some gelatinized starch reorganizes into structures that digestive enzymes reach less easily, called retrograded or type 3 resistant starch. Studies of common potatoes find more resistant starch in chilled samples than in freshly hot ones. Reheating can undo part of that structure, so it does not always preserve the full increase.
Olive-oil acidity is a laboratory measure of free fatty acids, conventionally expressed as grams of oleic acid per 100 g of oil. It is not pH and it does not directly measure sourness. Under international and EU standards, extra-virgin olive oil has a maximum free acidity of 0.8 g/100 g; virgin olive oil can be up to 2 g/100 g.
Olive-oil acidity is not something you taste the way you taste lemon acidity. It is a laboratory measurement of free fatty acids. Fruitiness comes from volatile aroma compounds, while bitterness and much of the peppery sensation are linked to phenolics. A very pungent extra-virgin oil can therefore have extremely low free acidity.
USDA Organic describes a certified production system with rules for soil fertility, prohibited substances, genetic engineering and livestock management. It does not mean pesticide-free and does not guarantee higher nutrient levels. A 2024 systematic review of 656 comparisons found 41.9% with no significant difference and concluded that nutritional superiority is not generalizable.
Turmeric is the rhizome of Curcuma longa used as a spice and food ingredient. Curcumin is one of its major curcuminoids and contributes to turmeric's yellow color. Supplements can concentrate curcumin far beyond a culinary serving, so supplement trials should not be interpreted as evidence for a teaspoon of turmeric.
The phrase plant milk covers products with very different nutrient profiles. Fortification can make calcium look similar to cow’s milk while protein remains far lower. The most useful comparison is the exact carton versus the dairy milk it may replace.
Calcium in many plant milks is added during manufacturing rather than coming mainly from the diluted almond, oat or soy itself. Current Silk examples range from 300 mg calcium per cup in unsweet soy to 470 mg in unsweet almond. Fortification can make calcium substantial, but it does not make every other nutrient equivalent to dairy milk.
Young jackfruit can mimic shredded-meat texture, but not its protein density: roughly 2–2.6 g/100 g versus about 20 g/100 g in raw 90/10 ground beef.
Sourdough and whole grain describe different things. Sourdough refers to a fermentation method; whole grain means the grain kernel retains the bran, germ and endosperm. A loaf can be white sourdough, whole-grain yeast bread or whole-grain sourdough. For fiber and grain nutrients, flour composition comes first; sourdough adds fermentation-related changes such as acidification and possible reductions in phytate and fructans.
Nutritional yeast is yeast that has been grown, inactivated and dried for use as food, usually as flakes or powder with a savory, umami flavor. It is not active baker’s yeast and will not make dough rise. A USDA survey reference provides about 40.4 g protein and 26.9 g fiber per 100 g, but a 10 g sprinkle is only about 4.0 g protein and 2.7 g fiber. Vitamin content varies dramatically depending on fortification.
Nutritional yeast is protein-dense, but vitamin B12 should never be assumed from the product name alone. A USDA survey reference provides about 40.4 g protein per 100 g, roughly 4 g in a 10 g serving. For B12, NIH lists several fortified brands at about 8.3–24 mcg per roughly 1/4 cup, while unfortified products may provide no reliable B12. Check the Nutrition Facts label every time.
Active sourdough starter does contain living lactic acid bacteria and yeasts, but ordinary baked sourdough bread is not a probiotic food in the usual sense. Baking heat and dehydration inactivate most of those organisms. Fermentation metabolites and non-living cell components can remain, but that is different from delivering a known dose of live microorganisms with a demonstrated health benefit.