Beef broth is one of the most keto-friendly foods you can drink. A standard cup of beef broth contains less than 1 gram of carbohydrates, virtually no sugar, and minimal fat. Whether you sip it plain, use it as a cooking base, or rely on it to get through the first rough days of ketosis, beef broth fits comfortably within even the strictest 20-gram daily carb limit.
Carbs, Protein, and Fat Per Cup
An 8-ounce cup of prepared beef broth (the kind made from bouillon or a standard can) has about 0.8 grams of carbohydrate, 0.84 grams of protein, and 0.19 grams of fat. That’s essentially zero impact on your daily carb budget. Even if you drank three or four cups throughout the day, you’d still be under 4 grams of carbs from broth alone.
Bouillon cubes land in a similar range. A single cube typically contains less than 2 grams of carbs once dissolved in water. The numbers shift slightly depending on the brand and what’s been added during manufacturing, but the baseline is consistently low enough that beef broth in any common form qualifies as keto.
Bone Broth vs. Regular Broth on Keto
If you’re choosing between standard beef broth and bone broth, both work on keto, but bone broth offers more nutritional density. Regular broth or stock contains roughly 2 to 6 grams of protein per cup. Bone broth, which is simmered much longer (often 12 to 24 hours or more), delivers 8 to 10 grams of protein per cup. That extra protein comes largely from collagen in the bones breaking down into gelatin during the long cooking process, which also gives bone broth its thicker, richer texture.
Most bone broth recipes call for an acidic ingredient like vinegar to help extract minerals and collagen from the bones more effectively. The carb count stays comparably low in both versions. For keto purposes, the choice comes down to whether you want a light sipping broth or something with more substance and protein. Bone broth fills you up more and provides amino acids like glycine, which is found in meaningful amounts in beef bone broth.
Why Keto Dieters Rely on Beef Broth
Beef broth does more than just fit your macros. During the first few days of a ketogenic diet, many people experience fatigue, headaches, and muscle cramps as their body adjusts to burning fat instead of carbohydrates. This cluster of symptoms, often called the “keto flu,” is driven largely by a rapid loss of water and electrolytes.
This is where beef broth becomes genuinely useful. A 10.5-ounce can of condensed commercial beef broth contains roughly 1,550 milligrams of sodium and 373 milligrams of potassium. Since ketosis causes your kidneys to flush sodium faster than usual, replacing it through broth is one of the simplest fixes. A warm cup or two per day during that transition period can meaningfully reduce keto flu symptoms without adding carbs.
Watch for Hidden Carbs in Store-Bought Broth
Not all commercial beef broths are created equal. The plain versions are reliably low-carb, but some store-bought options contain ingredients that can quietly add carbohydrates or trigger an insulin response. Thickening agents like guar gum, xanthan gum, and carrageenan are commonly used in canned soups, sauces, and broths. These are generally low in digestible carbs, but they signal a more processed product.
The bigger concern is added sugars or starch-based ingredients. Some brands include maltodextrin, caramel color, or sugar in their ingredient lists to enhance flavor. These additions can bump a serving’s carb count from under 1 gram to 3 or 4 grams, which still isn’t much on its own but adds up if you’re using broth liberally in recipes. Flip the label and check the total carbohydrate line. Anything under 1 to 2 grams per serving is a safe bet. If the ingredient list includes sugar or corn syrup in any form, pick a different brand.
Does Beef Broth Break a Fast?
Many keto dieters also practice intermittent fasting, which raises a practical question: can you drink beef broth during your fasting window? Technically, any drink containing calories ends a fast. Broth has a small amount of protein and fat, both of which trigger insulin release to some degree.
That said, the answer depends on your goals. If you’re doing a strict fast for autophagy or lab-measured ketone levels, even a cup of broth introduces enough calories and protein to interrupt the fasted state. On longer fasts of 24 hours or more, some practitioners allow small amounts of fat (including what’s in broth) on the rationale that it keeps the body in ketosis even if it isn’t a “pure” fast. For standard 16:8 intermittent fasting paired with keto, most people save broth for their eating window or treat it as a minor exception that doesn’t meaningfully derail results.
Making Keto Beef Broth at Home
Homemade broth gives you complete control over ingredients and is simple to prepare. For a basic version, simmer beef bones (marrow bones, knuckles, or oxtail work well) in water with a splash of apple cider vinegar for at least 12 hours. The vinegar helps pull minerals and collagen out of the bones. Add salt, pepper, and aromatics like onion, garlic, and bay leaves. Strain out the solids and you have a broth with zero hidden sugars, high sodium for electrolyte support, and more protein than anything from a can.
You can store homemade broth in the refrigerator for about five days or freeze it in portions for months. When it cools, a well-made bone broth will gel into a jelly-like consistency. That gelatin is the collagen you extracted, and it’s a sign the broth is rich in protein and amino acids. It liquefies again as soon as you reheat it.