The Dietary Reference Intakes set an Adequate Intake for total fiber of 25 g a day for women aged 19 to 50 and 38 g for men of the same ages. Measured against those, the 4.1 g in a 1 cup, cooked serving of oatmeal is 16% of the first and 11% of the second. US food labels use a single Daily Value of 28 g instead, which puts this serving at 15%.
Calorie for calorie, the figure is 2.2 g of fiber per 100 kcal (this serving is 182 kcal). Among the 200 prepared meals with USDA energy data here that is 65th, and 430th across all 957. The intakes above were derived from 14 g of fiber per 1,000 kcal, or 1.4 g per 100 kcal, so this food sits above the ratio a whole day of eating is meant to reach.
Getting all 25 g from oatmeal alone would take 7 servings, and 38 g would take 10. Most days reach the target through several different sources.
Dietary fiber and energy in Oatmeal for 100 g and the USDA household portions
Portion
Grams
Fiber
kcal
100 g
100
1.7 g
76
1 cup, cooked - this page's serving
240
4.1 g
182
1 cup, dry, yields
485
8.2 g
369
1 oz, dry, yields
170
2.9 g
129
Gram weights come from the household measures on the USDA record; fiber and energy for each portion are its per-100 g values scaled to that weight.
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