While many keto dieters try to avoid white or red onions because of their higher sugar content (6 grams per 100 grams), Ruani said that scallions are actually a great onion substitute, as they contain half the sugar amount of onions, but still have a ton of health benefits (think fiber and beneficial sulfur compounds).Click to see full answer. Just so, are red onions high in carbs?Onions are a pungent, nutritious vegetable. Although they are fairly high in carbs by weight, they’re usually consumed in small amounts because of their robust flavor. Summary Onions contain 5 grams of digestible carbs per serving and may help lower blood pressure and LDL cholesterol levels.Also Know, are red lentils Keto friendly? Although they all grow above ground, legumes like peas, beans and lentils and grains like corn and quinoa are all fairly high in carbs – so they are not good keto options. If you are keeping below the recommended 20 grams of carbs a day on keto, avoid eating them. Thereof, how many carbs are in a Red Onion? Carbohydrates make up about 9–10% of both raw and cooked onions. They consist mostly of simple sugars, such as glucose, fructose, and sucrose, as well as fiber. A 3.5-ounce (100-gram) portion contains 9.3 grams of carbs and 1.7 grams of fiber, so the total digestible carb content is 7.6 grams.Can you eat tomatoes on keto?Tomatoes. Some people group tomatoes with vegetables, but a tomato is actually a fruit. Low in fat but also carbs (with just 2.4 g of net carbs per ½ cup), tomatoes are also keto-friendly. Among their health benefits, tomatoes contain lycopene, which research suggests may help prevent heart disease.