Almost every week someone asks me whether BHB will kill their appetite. It’s a fair question, because a lot of keto marketing over the years has promised exactly that. The research on ketones and appetite is more interesting than the marketing, and it points to one variable most people never think about: how high your blood ketones actually go.

In this article I’ll walk through the human studies on ketone esters and ketone salts, show the blood levels each one reached, and explain what that means if you use goBHB® for energy, focus or weight management. I’ll also flag where the evidence is thin.

What the Research Says About Ketones and Appetite

The idea comes from ketogenic diets. People on strict keto often report less hunger, and a 2015 meta-analysis by Gibson and colleagues in Obesity Reviews found that people on ketogenic diets were slightly less hungry and had less desire to eat, even while losing weight. The authors noted the bigger benefit may be blunting the usual rise in hunger that comes with dieting.

A 2020 review by Deemer, Plaisance and Martins in Nutrition Research looked at whether ketones themselves cause that effect. Their conclusion was that nobody knows the exact blood ketone level needed to blunt appetite, and the human supplement data at the time came from a ketone ester drink that reduced hunger compared with dextrose.

The ketone ester studies

The best known trial is from Oxford. In 2018, Stubbs and colleagues gave 15 normal-weight adults either a ketone ester drink (1.9 kcal per kg of body weight) or a dextrose drink with the same calories after an overnight fast. Blood BHB rose from 0.2 to 3.3 mM within an hour. Hunger and desire to eat were about 50% lower from 1.5 to 4 hours after the ester drink compared with dextrose, and total ghrelin exposure was lower too. The ester was supplied by TΔS Ltd., a company where co-author Kieran Clarke is a director and Stubbs was an employee, which the paper discloses.

A Danish team led by Vestergaard ran a similar test in 2021 with 10 healthy young men, using a ketone ester, an equal-calorie glucose drink and a placebo. Peak BHB averaged 5.5 mM. Acylated ghrelin dropped about 25% after both the ester and glucose, but it stayed down after the ester while it bounced back after glucose. GLP-1 did not change with the ester. This one was funded by the authors’ own academic sources, not by a supplement company.

The ketone salt studies

Salts have not shown the same effect. In a 2023 study (Hägele and colleagues, Clinical Nutrition ESPEN), eight adults spent 24 hours in a metabolic chamber four separate times. One condition added 38.7 g of ketone salts to a normal diet. Blood ketones rose only a little, and appetite ratings did not differ from the control day.

Our own data lines up with that. In the 8-week KETAD trial, published in Nutrients in 2025, overweight adults took 10 g a day of BHB mineral salts on a modest calorie deficit. The conference poster from the same trial reported no effect on hunger or appetite scores, either after a single dose or after 8 weeks. The BHB group still lost more body weight than placebo (about 3.05 kg vs. 1.51 kg) and more DEXA-measured fat (1.97 kg vs. 0.82 kg), though those between-group differences were trends rather than statistically significant. Ketone Labs funded that study.

Why Blood Level Seems to Matter

Put these studies side by side and a pattern shows up. The trials that saw hunger and ghrelin drop pushed blood BHB to 3 to 5.5 mM. Salt studies sit far lower. In a 2017 Oxford study (Stubbs and colleagues, Frontiers in Physiology), a sodium and potassium BHB salt drink peaked at about 1.0 mM of D-BHB, compared with 2.8 mM for an ester given in matched amounts.

There’s a second wrinkle. The salt in that 2017 study was half L-BHB, and L-BHB stayed in the blood for more than 8 hours. Most finger-stick meters only read D-BHB, so a salt can look weaker on a meter than it is in total. Whether L-BHB affects hunger at all hasn’t been tested, as far as I can find. I break down the format differences in more detail in ketone salts vs. ketone esters.

What This Means for goBHB Users

I’d rather tell you this straight than sell you something. At the doses in most goBHB products, roughly 2 to 6 g per serving, you should not expect a big drop in hunger. That isn’t what the salt research shows, and it isn’t why we built the ingredient. Where BHB salts have looked more promising is body composition on a diet: in KETAD the BHB group lost more fat than placebo (a trend) while largely holding on to lean mass, and the Japanese D-BHB trials found less visceral fat area than placebo over 12 weeks at 1.5 to 2.9 g a day. I cover those in BHB and visceral fat.

If you want a straight BHB powder to test this on yourself, CleanForm Nutrition goBHB is a good place to start. CleanForm lists it as a 50/50 D/L blend of four mineral salts, in Unflavored, Tangy Apple and Strawberry Kiwi, with 30 servings per tub. The flavored versions are stevia-sweetened and 20 calories a scoop.

How I’d Use BHB if Hunger Is the Goal

If appetite control is your main reason for buying BHB, protein, fiber and sleep will do more for you than any ketone salt. Where I think BHB fits is during a calorie deficit, taken in the morning or mid-afternoon when energy dips and cravings tend to follow. KETAD participants took 5 g twice a day alongside a modest calorie deficit.

Keep your expectations tied to the data. A salt serving gives you a moderate rise in blood D-BHB. That may help with energy during a diet, but the strong hunger effects in the ester studies came at blood levels three to five times higher than salts typically reach. If you’re on a GLP-1 medication, your appetite is already being managed by the drug, and I wrote about how BHB may fit with that in our GLP-1 article.

A safety note: every BHB salt carries minerals, including sodium. If you watch your sodium intake, have kidney or blood pressure concerns, are pregnant, or take medication, check with your doctor before adding BHB salts. Our BHB salts side effects guide covers the stomach and mineral questions in detail.

Where the Evidence Stands

In short, high blood ketones appear to lower hunger and ghrelin for a few hours, based on two small ester trials with 15 and 10 people. Ketone salts have not shown the same effect in the two studies that measured it: one gave 8 people 38.7 g in a day, and the 8-week KETAD trial used 10 g a day. No study I know of has tested pure D-BHB at the 1.5 to 2.9 g doses used in Japan for appetite as a main outcome. That’s a gap we’d like to see filled with a proper trial.

Frequently Asked Questions

Do BHB supplements suppress appetite?

The salt studies so far say not much. A 24-hour trial with 38.7 g of ketone salts and the 8-week KETAD trial at 10 g a day (per the trial’s conference poster) both found no change in appetite ratings. The hunger drop seen in research came from ketone esters that raised blood BHB to 3 mM or more.

Do ketone esters reduce hunger better than salts?

In the studies available, yes. Esters raised blood BHB to 3.3 to 5.5 mM and lowered ghrelin, while a salt drink peaked near 1.0 mM of D-BHB.

Does BHB affect ghrelin?

Ketone ester drinks lowered ghrelin in two small trials, by about 25% in one compared with placebo. The effect lasted longer than after a glucose drink. Nobody has shown the same with BHB salts at normal serving sizes.

Will BHB break my fast?

BHB is a fuel, so it does carry some calories. CleanForm lists its stevia-sweetened goBHB flavors at 20 calories a scoop. Whether that breaks your fast depends on why you fast: strict calorie restriction or keeping insulin low.

The Bottom Line

The research on ketones and appetite is real, but it was done mostly with ketone esters at blood levels that salts don’t usually reach. If you’re using goBHB, use it for steady energy and as support during a diet, and handle hunger with food choices and sleep. I’ll update this post if a trial tests D-BHB or goBHB with appetite as the main outcome.

Sources: Stubbs BJ, et al. A Ketone Ester Drink Lowers Human Ghrelin and Appetite. Obesity. 2018. Vestergaard ET, et al. Acute ketosis inhibits appetite and decreases plasma concentrations of acyl ghrelin in healthy young men. Diabetes Obes Metab. 2021. Hägele FA, et al. Impact of one-day fasting, ketogenic diet or exogenous ketones on control of energy balance in healthy participants. Clin Nutr ESPEN. 2023. Roeth EJ, et al. Effect of Exogenous Ketones as an Adjunct to Low-Calorie Diet on Metabolic Markers. Nutrients. 2025;17(22):3582. Stubbs BJ, et al. On the Metabolism of Exogenous Ketones in Humans. Front Physiol. 2017. Deemer SE, et al. Impact of ketosis on appetite regulation: a review. Nutr Res. 2020. Gibson AA, et al. Do ketogenic diets really suppress appetite? A systematic review and meta-analysis. Obes Rev. 2015. Product details from cleanformnutrition.com.