Sweet potato, boiled

One serving of Sweet potato, boiled — 1 medium (150 g) — comes to 159 kcal, 2 g protein, 36.5 g carbs and 0.5 g fat. Scaled to 100 g it works out to 106 kcal and 1.3 g protein, which makes it not a meaningful protein source on its own for a vegetable item. That single serving is about 10.6% of a 1,500 kcal day and 8% of a 2,000 kcal day, so it's more of a filler than a target-hitter on protein without much extra planning.

Walking off Sweet potato, boiled takes roughly 3,975 steps, using the rough approximation of 0.04 kcal burned per step (a population-average estimate for a moderate walking pace, not a personalised number). At ₹6 a serving it costs about ₹60 for every 20 g of protein it delivers, which is a mid-to-high price for protein compared with dal, eggs or soya chunks. It fits nearly every Indian diet type, including vegetarian, vegan, eggetarian. It works at breakfast and the evening snack slot. It's commonly eaten on fasting days (Navratri/Ekadashi-style).

If you want variety without changing the macros much, the closest swaps in the vegetable category are Aloo gobi, Aloo matar, Aloo methi, Baingan bharta — each keeps a similar role on the plate while shifting the exact protein-to-carb balance a little.