Bone broth can support weight loss, but not because it contains a magic fat-burning ingredient. At roughly 39 calories and 9 grams of protein per cup, it’s one of the lowest-calorie ways to get a meaningful dose of protein, making it useful as a snack replacement, a fasting aid, or a tool for reducing overall calorie intake without feeling deprived.
Why the Calorie-to-Protein Ratio Matters
A cup of beef bone broth delivers about 39 calories, 9 grams of protein, 1 gram of fat, and zero carbohydrates or sugar. Chicken bone broth tends to be even leaner, with a higher amino acid content and less fat. Compare that to other common snacks: a handful of almonds runs about 170 calories, a granola bar around 150, and a latte with milk close to 130. Swapping one or two daily snacks for a cup of bone broth can quietly cut 200 to 300 calories from your day.
Protein is also the most satiating macronutrient. It slows digestion and helps you feel full longer than the same number of calories from carbs or fat. Sipping bone broth between meals gives you that satiety signal at a fraction of the caloric cost of solid food, which makes it easier to stick with a calorie deficit over time.
Glycine and Body Fat
Glycine, the most abundant amino acid in bone broth, has an interesting relationship with body composition. A study published in PLOS ONE found that higher blood levels of glycine were significantly associated with lower abdominal fat and better insulin sensitivity. People with more glycine in their blood tended to have less of the deep visceral fat that wraps around organs and drives metabolic problems.
The connection likely works through a few pathways. Glycine is a building block of glutathione, your body’s primary antioxidant. When glutathione levels drop, inflammation rises and insulin works less efficiently. Animal studies have shown that glycine supplementation reduced intra-abdominal fat accumulation, lowered circulating blood sugar and triglycerides, and even shrank individual fat cells in obese models. None of this means bone broth will melt belly fat on its own, but the amino acid profile nudges your metabolism in a favorable direction, especially if your diet is otherwise lacking in these compounds.
Bone Broth During Intermittent Fasting
One of the most popular uses for bone broth is as a fasting companion. Technically, because it contains calories and protein, bone broth breaks a strict fast. In practice, at around 50 calories per cup with no sugar, it produces a minimal insulin response. Insulin needs to stay low for your body to remain in a fat-burning state, and bone broth’s near-zero carbohydrate content keeps that hormone largely undisturbed.
For people who struggle with the hunger, lightheadedness, or electrolyte drops that come with longer fasting windows, bone broth offers a practical compromise. It provides sodium, potassium, and hydration that plain water doesn’t. Many people find that a cup or two during a fasting window makes the difference between a sustainable routine and one they abandon after a week. If your goal is weight loss rather than the absolute purest metabolic fast, the trade-off is almost always worth it.
The Bone Broth Diet Approach
Some structured plans build entire protocols around bone broth. The most well-known version works like this: five days per week, you eat whole-food meals built around protein, vegetables, fruit, and healthy fats, with two cups of bone broth as daily snacks. On two nonconsecutive days, you do a mini-fast where you consume either six cups of bone broth throughout the day or five cups plus a small snack of protein, vegetables, and fat in the evening. You stop eating by 7 p.m. on all days.
This structure creates a calorie deficit through two mechanisms. The mini-fast days dramatically cut intake (six cups of bone broth totals roughly 230 to 300 calories for the entire day). The non-fasting days, while more generous, still eliminate processed foods, added sugars, and most calorie-dense snacking. Weight loss on plans like this is real, but it comes from the overall calorie reduction and food quality improvements, not from bone broth itself being a fat burner.
Watch the Sodium
If you’re drinking multiple cups of bone broth per day, sodium adds up quickly. Commercial brands range widely: some contain around 270 milligrams per cup, while others pack over 500 milligrams in the same serving. At three or four cups a day, you could be taking in 1,000 to 2,000 milligrams of sodium from broth alone, which is a significant chunk of the 2,300-milligram daily limit most guidelines recommend.
Excess sodium promotes water retention, which can mask fat loss on the scale and leave you feeling bloated. If you’re using bone broth as a regular part of your weight loss strategy, check labels and choose lower-sodium options, or make your own at home where you control the salt. Homemade versions also let you simmer the bones longer (24 hours or more), which extracts more collagen and minerals without requiring extra seasoning to compensate for flavor.
How to Use It Practically
You don’t need a formal bone broth diet to benefit. The simplest approach is to replace one or two daily snacks with a warm cup of broth. This works especially well in the late afternoon, when hunger tends to spike and people reach for higher-calorie options. Because it’s warm, savory, and requires slow sipping, it also slows you down in a way that a handful of crackers or a protein bar doesn’t.
Another effective strategy is drinking a cup 15 to 20 minutes before a meal. The combination of warm liquid, protein, and sodium partially fills your stomach and takes the edge off hunger, which often leads to eating smaller portions at the meal itself. Over weeks and months, these small reductions compound into meaningful calorie savings.
Bone broth also works well as a base for low-calorie soups. Adding vegetables, leafy greens, or a small amount of lean protein to a cup of broth turns it into a filling meal that rarely exceeds 150 to 200 calories. For people who find calorie counting tedious, building meals around broth-based soups is a low-effort way to stay in a deficit without tracking every gram.