Lowest calories per 100 g: 25 foods ranked

Foods ranked by energy per 100 g, lowest first, per USDA FoodData Central. First is Beverages, coffee, brewed, prepared with tap water at 1 kcal per 100 g; the table lists the top 25.

#	Food	kcal per 100 g	kcal	Protein	Carbs	Fat
1	Beverages, coffee, brewed, prepared with tap water Beverages	1	1	0.1 g	0 g	0 g
2	Cucumber, peeled, raw Vegetables	10	10	0.6 g	2.2 g	0.2 g
3	Pickles, cucumber, dill or kosher dill Vegetables	12	12	0.5 g	2 g	0.4 g
4	Cucumber, with peel, raw Vegetables	16	16	0.6 g	3 g	0.2 g
5	Radishes, raw Vegetables	16	16	0.7 g	3.4 g	0.1 g
6	Celery, raw Vegetables	17	17	0.5 g	3.3 g	0.2 g
7	Lettuce, cos or romaine, raw Vegetables	17	17	1.2 g	3.2 g	0.3 g
8	Lettuce, iceberg, raw Vegetables	17	17	0.7 g	3.4 g	0.1 g
9	Tomatoes, red, ripe, raw, year round average Vegetables	18	18	0.9 g	3.9 g	0.2 g
10	Radishes, red, raw Vegetables	20	20	0.7 g	4.1 g	0.1 g
11	Asparagus, raw Vegetables	20	20	2.2 g	3.9 g	0.1 g
12	Broccoli raab, raw Vegetables	22	22	3.2 g	2.9 g	0.5 g
13	Spinach, raw Vegetables	23	23	2.9 g	3.6 g	0.4 g
14	Broccoli raab, cooked Vegetables	25	25	3.8 g	3.1 g	0.5 g
15	Cabbage, raw Vegetables	25	25	1.3 g	5.8 g	0.1 g
16	Eggplant, raw Vegetables	26	26	0.9 g	5.4 g	0.1 g
17	Mustard greens, raw Vegetables	27	27	2.9 g	4.7 g	0.4 g
18	Tomatoes, grape, raw Vegetables	27	27	0.8 g	5.5 g	0.6 g
19	Cauliflower, raw Vegetables	28	28	1.6 g	4.7 g	0.2 g
20	Broccoli, stalks, raw Vegetables	28	28	3 g	5.2 g	0.4 g
21	Asparagus, green, raw Vegetables	28	28	1.4 g	5.1 g	0.2 g
22	Lemons, raw, without peel Fruits	29	29	1.1 g	9.3 g	0.3 g
23	Peppers, jalapeno, raw Vegetables	29	29	0.9 g	6.5 g	0.4 g
24	Sauce, salsa, ready-to-serve Prepared dishes	29	29	1.4 g	6.7 g	0.2 g
25	Limes, raw Fruits	30	30	0.7 g	11 g	0.2 g