Cook one cup and plan two meals for it. A cup of boiled lentils weighs 198 grams and carries 15.6 grams of fiber, 17.9 grams of protein and 4 milligrams of sodium, calculated from USDA's entry for lentils boiled without salt; that fiber is 56 percent of the 28-gram Daily Value the FDA prints on the Nutrition Facts label. The condition that changes the answer is the can. Canned black beans carry 922 milligrams of sodium per cup, and the same beans drained and rinsed carry far less.
One cooked cup, measured
Three pulses that most US kitchens already recognize, at one cup cooked, from USDA FoodData Central.
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| Pulse (1 cup cooked) | Weight | Fiber | Protein | Sodium |
|---|---|---|---|---|
| Lentils | 198 g | 15.6 g | 17.9 g | 4 mg |
| Black beans | 172 g | 15.0 g | 15.2 g | 2 mg |
| Chickpeas | 164 g | 12.5 g | 14.5 g | 11 mg |
Each is well past 20 percent of the fiber Daily Value, the level the FDA's label guidance calls high. The differences between them are small enough that texture and flavor, not the table, decide which one you cook.
The can is where the sodium is
USDA's entry for canned black beans records 384 milligrams of sodium per 100 grams, or 922 milligrams in a 240-gram cup: 40 percent of the 2,300-milligram Daily Value in one cup. The low-sodium canned version records 138 milligrams per 100 grams, 331 milligrams a cup. USDA's 2023 measurement of canned black beans drained and rinsed lands at 218 milligrams per 100 grams.
So the can is convenient and the rinse is cheap. Two minutes under the tap moves a cup of beans from 922 milligrams to roughly half that, and the fiber and protein stay where they were. That is the same reasoning that applies to fresh, frozen or canned for tonight: the form is a convenience decision, and the packing liquid is the part worth acting on.
Give the same cup a second job
Cook once, then change the role rather than the recipe.
- Spoonable. The pulse stays whole in liquid: a soup, a brothy pot with a grain.
- Filling. Partly mashed, seasoned, in a wrap or between bread. Texture is the variable; mash about half.
- Accompaniment. A small bowl of the cooked pulse, dressed and served beside the main dish, the way a vegetable side sits beside the meal instead of replacing it.
- Alongside a grain. Served next to it, not stirred in, so each keeps its texture until the plate.
Change one thing at a time. If you change the pulse, the seasoning, the form and the method at once, a disappointing dinner tells you nothing about which decision to keep. And when the result does not work, describe the part that failed rather than the food: "too soft for a filling" points at the mash, "the flavor covered the rest of the plate" points at the serving bowl.
One distinction is worth keeping straight throughout. Dry pulses and canned pulses are different starting ingredients, and a recipe written for one is not directions for the other; USDA lists them as separate foods for that reason.
A two-dinner example
An example with real quantities: a pot of lentils boiled without salt and measured out at three cups, 594 grams at USDA's 198 grams per cup. Monday, one cup goes into a soup. Wednesday, a second cup is mashed roughly and seasoned as a sandwich filling. The third stays in the refrigerator as the accompaniment. Across the three meals that is 46.8 grams of fiber and 12 milligrams of sodium from the lentils themselves, which puts the salt decision entirely in the seasoning you add.
Name the food and name the source
Beans carry histories that a nutrient table does not hold. UNESCO inscribed "Traditional Mexican cuisine — ancestral, ongoing community culture, the Michoacán paradigm" on its Representative List in 2010, and its description puts the system's basis as corn, beans and chili, maintained by collectives of women cooks in Michoacán and across Mexico (UNESCO, 2010). That is one inscription, about named communities in named places.
It is not a recipe for your Wednesday sandwich, and your Wednesday sandwich is not Mexican cooking. An inscription records that a community holds a practice; it does not hand the practice to everyone who reads about it, and it does not turn an ingredient into a claim about health. Keep the source attached to what it describes, the way a grain keeps its name in one grain, several food stories, and the curiosity and the dinner can both stay honest.
Sources and further reading
- Lentils, mature seeds, cooked, boiled, without salt (FDC 172421)Accessed 2026-09-17
- How to Understand and Use the Nutrition Facts LabelAccessed 2026-09-17
- Beans, black, mature seeds, cooked, boiled, without salt (FDC 173735)Accessed 2026-09-17
- Chickpeas (garbanzo beans, bengal gram), mature seeds, cooked, boiled, without salt (FDC 173757)Accessed 2026-09-17
- Beans, black turtle, mature seeds, canned (FDC 175188)Accessed 2026-09-17
- Beans, black, mature seeds, canned, low sodium (FDC 175238)Accessed 2026-09-17
- Beans, black, canned, sodium added, drained and rinsed (FDC 2644285)Accessed 2026-09-17
- Traditional Mexican cuisine — ancestral, ongoing community culture, the Michoacán paradigmAccessed 2026-09-17