Short answer

THC binds CB1 receptors in the hypothalamus, brainstem, and nucleus accumbens. That binding raises food intake in lab studies and in some human trials. Two THC drugs hold FDA approval in the US: dronabinol (Marinol) and nabilone (Cesamet). Dronabinol is approved for anorexia with weight loss in AIDS patients. For cancer-related anorexia, results are mixed. In a 2002 trial of 469 patients, dronabinol alone raised appetite and weight less than megestrol acetate.

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How THC changes appetite

THC acts on three pathways:

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  • CB1 receptors in the hypothalamus and brainstem, which control hunger signals.
  • Ghrelin release. Rodent studies show a rise in ghrelin after THC.
  • Reward and smell. THC raises sensitivity to food odors and the pleasure of eating.

CBD does not bind CB1 the same way. High doses of CBD may blunt THC effects. Human data on CBD and appetite is thin.

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FDA-approved cannabinoid drugs

  • Dronabinol (Marinol, Syndros): 2.5 mg twice a day, one hour before lunch and dinner. Label maximum is 20 mg per day.
  • Nabilone (Cesamet): 1 to 2 mg twice a day. Approved for chemotherapy-induced nausea.

Both are synthetic forms of THC. Both need a prescription.

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Forms, onset, duration

  • Inhaled flower or vape: onset 5 to 10 minutes. Peak 15 to 30 minutes. Duration 2 to 4 hours.
  • Sublingual tincture: onset 15 to 45 minutes. Duration 4 to 6 hours.
  • Edible: onset 30 to 120 minutes. Peak 2 to 4 hours. Duration 4 to 8 hours.
  • Capsule: onset 60 to 180 minutes. Duration 6 to 8 hours.

Edibles delay onset. A second dose taken at 30 minutes stacks on the first and can cause a heavy effect. Wait 2 hours before redosing.

Cannabinoids to pick and avoid

  • THC: the main driver of appetite in studies. Dispensary flower often tests at 15 to 25 percent THC.
  • CBD: no clear appetite effect. Some users report less appetite at 300 mg or more per day.
  • CBG: rodent data shows appetite increase. Human data is thin.
  • THCV: small human trials at 10 mg show appetite reduction. Skip THCV products if the goal is eating.

Terpenes

Myrcene, beta-caryophyllene, and limonene appear in strains sold for appetite. Human trials on terpenes and food intake do not exist in useful numbers. Treat terpene claims as marketing.

Steps for a first trial

  1. Start at 2.5 mg THC by mouth, or one 2 to 3 second inhale.
  2. Log time, dose, and food eaten for 7 days.
  3. Keep water and calorie-dense food within reach. Nuts, yogurt, peanut butter.
  4. Wait 2 hours before a second dose.
  5. Raise the dose by 2.5 mg each step. Stop at the dose that works.

Side effects

Common effects: dry mouth, dizziness, fast heart rate, a drop in blood pressure on standing, short-term memory changes, sedation. Risk of falls rises in adults over 65. Heavy use each day can cause cannabinoid hyperemesis syndrome, which brings vomiting and abdominal pain. NIDA estimates about 3 in 10 people who use cannabis develop cannabis use disorder.

Groups who should not use

  • Anyone under 21 in adult-use states, and under 25 for brain development.
  • Pregnancy and breastfeeding.
  • Heart disease, arrhythmia, or a recent cardiac event.
  • Personal or family history of psychosis.
  • History of cannabis use disorder.

Interactions

THC is metabolized by CYP2C9 and CYP3A4. Check with a pharmacist if you take warfarin, clobazam, tacrolimus, some HIV antivirals, or CNS depressants such as opioids and benzodiazepines.

Access in the US

State rules differ. Medical programs set lower age limits in some states and carry no sales tax in others. Adult-use sales require age 21. Product labels list THC and CBD in milligrams. Read the label instead of the strain name.