Protein content
5 g of protein in 1 cup (255 g) of mashed sweet potato, or 2 g for every 100 kcal it supplies.
Share of this food's calories that come from protein - it is more of an energy food than a protein food.
| Protein per 100 kcal | 2 g |
|---|---|
| Protein per 100 g | 1.98 g |
| Protein per serving | 5 g in 1 cup (255 g) |
| Calories from protein | 8% |
| Leucine per serving | 0.37 g |
| Rank in vegetables, per 100 kcal | 91st of 105 |
| Rank of all foods, per 100 g | 676th of 796 |
| Share of 50 g Daily Value | 10% per serving |
| Protein quality | Incomplete protein |
One 1 cup, 5 g protein.
Every 100 kcal of mashed sweet potato brings 2 g of protein. On that measure it ranks 91st of the 105 vegetables in this database and 701st of all 796 foods on the site. Measured by weight instead, its 1.98 g per 100 g ranks 50th in its group.
Only about 8% of the calories in mashed sweet potato come from protein, so it is more of an energy food than a protein food. It is worth eating for other reasons; the protein it adds to a day is incidental.
USDA lists 0.2 g of fat per 100 g of mashed sweet potato, too little for a protein-to-fat ratio to mean much.
Set against creamed corn, another vegetable entry in the database, a serving carries about 0.5 g more protein (creamed corn has 4.5 g per 1 cup).
It is an incomplete protein on its own; pairing it with other plant foods across the day covers the full range of essential amino acids. The serving quoted here is measured by volume at 255 g, and it covers about 10% of the 50 g FDA Daily Value for protein.
Serving sizes
| Portion | Weight | Protein | Calories |
|---|---|---|---|
| 100 g | 100 g | 1.98 g | 101 kcal |
| 1 cup (serving used here) | 255 g | 5 g | 258 kcal |
| 1 can (404 x 307) | 496 g | 9.8 g | 501 kcal |
Portion weights are the household measures listed on the USDA record; protein and calories scale from the per-100 g figures.
Amino acids
| Amino acid | Per 100 g | Per serving | mg per g protein |
|---|---|---|---|
| leucine | 0.145 g | 0.37 g | 73 |
| lysine | 0.097 g | 0.25 g | 49 |
| valine | 0.129 g | 0.33 g | 65 |
| isoleucine | 0.099 g | 0.25 g | 50 |
| threonine | 0.098 g | 0.25 g | 49 |
| phenylalanine | 0.119 g | 0.3 g | 60 |
| methionine | 0.049 g | 0.12 g | 25 |
| histidine | 0.037 g | 0.09 g | 19 |
| tryptophan | 0.024 g | 0.06 g | 12 |
Per-100 g values are the amino acid analysis on the USDA record. The serving and per-gram-of-protein columns are arithmetic on those values; they are not a protein quality score.
Related
Highest-protein vegetables per serving · Most protein-dense foods · Highest protein per 100 g
Quick answers
1.98 g. The 1 cup serving used on this page weighs 255 g and so carries 5 g.
2 g. That figure divides its 1.98 g of protein per 100 g by its 101 kcal per 100 g, so it does not depend on serving size.
No. On its own, the protein in mashed sweet potato is short of at least one essential amino acid; other protein sources across the day fill the gap.
About 10%. One 1 cup serving has 5 g, and the FDA Daily Value for protein is 50 g.
Figures from USDA FoodData Central record #169305 (Sweet potato, canned, mashed), SR Legacy data. USDA data is in the public domain. Values are the published reference figures for that record, not lab measurements for a specific brand or batch.