I don't weight or measure my food, but I was curious to know the nutritional info of the daily sweet potato I was eating. Of the three varieties I roasted, they were generously-sized weighing about 400 grams (sometimes 500). Here's the nutritional info from VeryWell.com for 400 grams of a regular sweet potato (left) and a Japanese sweet potato (right).
90 percent of the time, I ate my sweet potato with one-pound (16 ounces) of steamed veggies, which is just a small bag you'd get in the freezer section. It offered about 125 calories, so this was a perfectly-sized 500- to 600-calorie meal for me. When I first started eating this lunch, I'd sprinkle Trader Joe's Everything But the Bagel Seasoning on the veggies, but after a week or so, I really enjoyed it plain!
People often ask vegans, "Where do you get your protein?" Just look at the protein from the sweet potato! The pound of broccoli adds another 10 grams.