HCG Diet Guide: Rules, Benefits, and Foods to Eat
Diet guide
Rules, foods & sample plan
The HCG Diet combines a dangerous 500-calorie daily limit with human chorionic gonadotropin — a hormone the FDA says is not approved for weight loss and whose OTC 'homeopathic' forms are illegal; every systematic review finds HCG adds zero benefit above the starvation-level diet alone.
The HCG Diet is a weight-loss regimen that pairs human chorionic gonadotropin (HCG), a pregnancy hormone, with a 500-calorie-per-day diet. Introduced in the 1950s by British physician A.T.W. Simeons, the protocol claims HCG suppresses hunger and redistributes fat. The FDA has explicitly warned that over-the-counter HCG weight-loss products are illegal and that HCG is not approved for weight loss. A 1995 systematic review of 24 trials concluded HCG provides no benefit beyond the starvation-level calorie restriction alone.
This is general nutrition and wellness information, not medical advice. If you're on a weight-loss medication or managing a health condition, confirm specifics with your clinician.
How the HCG Diet diet works
A weight-loss regimen combining HCG (human chorionic gonadotropin, a pregnancy hormone) — as injections or 'homeopathic' drops, pellets, or sprays — with a very-low-calorie diet of approximately 500 calories/day. Introduced by British physician A.T.W. Simeons in the 1950s. The FDA has explicitly warned that OTC homeopathic HCG weight-loss products are illegal and that HCG is not approved for weight loss. Any weight lost comes solely from the 500-calorie diet, not from the hormone.
The rules of the HCG Diet diet
~500 kcal/day (some versions 500–800 kcal)
Take HCG in some form (prescription injection or illegal OTC 'homeopathic' product)
Follow a rigid, very restricted food list
Butter and oils are typically not permitted
Foods to eat & avoid
Eat freely
- Very limited lean protein (specific cuts only)
- Select approved vegetables
- Small amounts of fruit
- All constrained within the ~500-calorie ceiling; no fats or oils
Limit or skip
- Almost everything beyond the tiny approved list
- Fats and oils
- Sugar
- Most carbohydrates
Benefits & honest risks
Every diet has upsides and catches. Here's the balanced picture before you commit.
- None attributable to HCG; any weight loss comes solely from severe calorie restriction
- FDA warns: HCG is not approved for weight loss and OTC 'homeopathic' HCG weight-loss products are illegal
- 500 kcal/day carries documented risks: gallstones, electrolyte imbalance, and irregular heartbeat; this level of restriction can be fatal
- Reported HCG side effects: depression, fatigue, fluid retention (edema), gynecomastia, and blood clots (thromboembolism)
- Severe muscle loss from extreme protein and calorie restriction
- Contraindicated for anyone with cardiovascular disease, kidney disease, or history of gallstones
What the research says
Strong evidence of NO benefit from HCG and clear evidence of harm from the 500-calorie diet. Lijesen et al. 1995 (British Journal of Clinical Pharmacology 40(3):237–243), reviewing 8 controlled and 16 uncontrolled trials: 'there is no scientific evidence that HCG is effective in the treatment of obesity.' The FDA, Mayo Clinic, and Cleveland Clinic all advise against this regimen.
Your sample day
3.5 oz poached white fish with 1 cup steamed spinach
3.5 oz grilled skinless chicken breast with sliced cucumber
1 small apple
What Is the HCG Diet and Why Did the FDA Issue a Warning?
The HCG Diet is a weight-loss protocol that combines a pregnancy hormone with near-starvation calorie levels — and the FDA has been unequivocal: over-the-counter HCG weight-loss products are illegal, and HCG is not approved for weight loss in any form.
British endocrinologist A.T.W. Simeons introduced the regimen in the 1950s, theorizing that injections of human chorionic gonadotropin (HCG) — a hormone produced during pregnancy — would suppress hunger and selectively mobilize stored fat while patients consumed just 500 calories per day. The protocol spread through word of mouth and later through internet marketing, spawning a cottage industry of 'homeopathic' HCG drops, pellets, and sprays sold over the counter.
The FDA began issuing warning letters to manufacturers of OTC HCG weight-loss products in 2011 and has since made its position explicit: these products are illegal. The agency states that HCG has not been demonstrated to be effective for weight loss, and that any product claiming otherwise is misbranded. Prescription HCG exists for legitimate medical indications such as fertility treatment, but no FDA-approved indication exists for obesity.
Bottom line
The FDA's position is unambiguous: OTC HCG weight-loss products are illegal, and prescription HCG is not approved for weight loss. This is not a medical controversy — it is settled regulatory fact.
The 500-Calorie HCG Diet — What You Are Actually Eating
A 500-calorie day is closer to a medically supervised fast than a sustainable diet — it provides less than 25 to 30 percent of most adults' basic energy needs and eliminates entire macronutrient categories.
The HCG Diet food list is extraordinarily restrictive. Protein sources are limited to specific lean cuts — typically skinless chicken breast, white fish, or very lean beef — in portions of roughly 3.5 ounces (100 grams), cooked without any fat. Vegetables are confined to a short approved list: lettuce, celery, cucumber, spinach, tomatoes, and a few others. One or two small servings of fruit — an apple, a handful of strawberries, or half a grapefruit — round out the day. All oils, butter, dressings, and added fats are forbidden.
What this looks like in practice: a typical day might include 3.5 ounces of poached white fish with a cup of steamed spinach for lunch, and 3.5 ounces of grilled chicken breast with sliced cucumber for dinner, plus one small apple. That totals roughly 500 calories. There is no room for breakfast beyond black coffee or tea. The diet provides virtually no dietary fat, minimal carbohydrates, and protein intake far below what is needed to preserve lean mass during weight loss.
Medically supervised very-low-calorie diets (VLCDs) exist — they provide 800 calories or fewer but are nutritionally fortified with complete protein, essential fatty acids, vitamins, and minerals, and are administered under physician monitoring. The HCG Diet provides none of these safeguards. It is a starvation diet with a hormone product attached.
Bottom line
A 500-calorie day is closer to starvation than a diet — it provides less than 25–30% of most adults' basic energy needs and omits entire macronutrient categories.
Does HCG Actually Help You Lose Weight? The Evidence
The question of whether HCG contributes to weight loss was settled by a comprehensive systematic review published in 1995 — and the answer is no.
Researchers Lijesen and colleagues reviewed 8 controlled trials and 16 uncontrolled trials examining the Simeons HCG protocol. Their conclusion, published in the British Journal of Clinical Pharmacology, was direct: 'There is no scientific evidence that HCG is effective in the treatment of obesity; it does not bring about weight-loss of fat-redistribution, nor does it reduce hunger or induce a feeling of well-being.' In every controlled study, patients receiving HCG injections lost the same amount of weight as those receiving placebo injections — because both groups were eating 500 calories per day.
The weight loss that occurs on the HCG Diet is entirely attributable to severe calorie restriction. A 500-calorie daily intake creates an energy deficit of roughly 1,500 to 2,000 calories per day for most adults, which predictably produces rapid weight loss — at the cost of muscle tissue, metabolic slowdown, and the medical risks detailed below. The hormone adds nothing. The Mayo Clinic, Cleveland Clinic, and every major medical organization that has reviewed the protocol have reached the same conclusion: HCG does not work for weight loss.
Bottom line
A systematic review of 8 controlled trials and 16 uncontrolled trials concluded that HCG 'does not bring about weight-loss of fat-redistribution, nor does it reduce hunger or induce a feeling of well-being.' The hormone component is evidentially inert for weight loss.
HCG Diet Dangers — What a 500-Calorie Limit Can Do to Your Body
The risks of the HCG Diet are not theoretical — they are documented across the medical literature, and the FDA advisory exists precisely because injuries from this protocol occur.
Gallstone formation is one of the most well-established complications of very-low-calorie diets. When the body breaks down fat rapidly and gallbladder emptying slows due to the near-absence of dietary fat, cholesterol can concentrate and form stones. Electrolyte disturbances — particularly potassium and magnesium depletion — can trigger cardiac arrhythmias, which at this level of restriction have been fatal in some cases. The diet's severe protein limitation drives disproportionate muscle loss; the body catabolizes its own tissue to meet amino acid requirements that the diet does not supply.
HCG itself carries side effects. Reported adverse events include depression, fatigue, fluid retention (edema), gynecomastia (breast tissue development in men), and thromboembolism (blood clots). The hormone is not benign, even when the weight-loss claim is false. For anyone with underlying cardiovascular disease, kidney disease, or a history of gallstones, the protocol is contraindicated — but because the diet is typically self-administered without medical screening, these contraindications are rarely identified before harm occurs.
Bottom line
The risks of the HCG Diet are not theoretical — they are documented across the medical literature, and the FDA advisory exists precisely because injuries from this protocol occur.
HCG Diet and GLP-1 Medications — An Absolutely Inadvisable Combination
Combining a 500-calorie diet with GLP-1 receptor agonists like semaglutide or tirzepatide is dangerous on multiple dimensions — and no responsible clinician would endorse it.
GLP-1 medications work in part by reducing appetite and slowing gastric emptying. Layering that appetite suppression on top of a 500-calorie protocol can drive total daily intake to catastrophically low levels, making it nearly impossible to consume even the minimal protein and micronutrients the HCG Diet theoretically allows. The result is accelerated muscle wasting, severe nutrient deficiencies, and heightened risk of cardiac complications from electrolyte imbalance.
Muscle loss is already a concern with GLP-1 therapy. In the STEP-1 trial for semaglutide, approximately 45 percent of total weight lost was lean mass. Adequate protein intake and resistance exercise are the primary strategies to mitigate this. The HCG Diet provides roughly 30 to 40 grams of protein per day — less than half of what is recommended for someone actively losing weight on a GLP-1 medication. The combination would predictably strip muscle at an alarming rate.
Gallstone risk compounds as well. Both GLP-1 medications and very-low-calorie diets independently increase the risk of gallstone formation. Combining them multiplies that risk. The FDA's warning against HCG weight-loss products applies regardless of what other medications a person is taking — but the addition of a GLP-1 agonist makes an already dangerous protocol even more hazardous.
Bottom line
This combination has no defensible place in any weight-management plan — the 500-calorie diet is dangerous on its own, and GLP-1's appetite suppression compounds every risk it carries.
What most pages leave out
The most critical fact competitors bury: this is not a controversial alternative diet — OTC HCG weight-loss products are explicitly illegal per the FDA, and a 24-trial systematic review from 1995 concluded the hormone adds nothing. Any content that presents the HCG Diet as a viable option for consideration without leading with this regulatory and evidence reality is misleading its readers.
We flag this so you can make an informed choice — not to scare you off.
❓Frequently Asked Questions
A regimen combining human chorionic gonadotropin (HCG, a pregnancy hormone) with a 500-calorie/day diet, introduced in the 1950s. The FDA says HCG is not approved for weight loss and that OTC 'homeopathic' HCG products are illegal.
No — a systematic review of 24 trials (Lijesen et al. 1995) concluded HCG 'does not bring about weight-loss of fat-redistribution, nor does it reduce hunger or induce a feeling of well-being.' Any weight loss comes from the 500-calorie diet alone.
Prescription HCG used for legitimate medical purposes is legal, but HCG sold OTC as a 'homeopathic' weight-loss product is illegal per the FDA.
Yes — 500 kcal/day is below medically recognized safe minimum levels, and documented risks include gallstones, electrolyte imbalance, irregular heartbeat, muscle loss, edema, and thromboembolism.
Only very small portions of specific lean proteins, select vegetables, and limited fruit within a ~500-calorie ceiling; no fats or oils are permitted.
Simeons's original protocol paired the hormone with 500 kcal/day under the theory that HCG would mobilize fat stores and suppress hunger — a claim not supported by any controlled trial.
No — this combination is medically inadvisable; GLP-1 appetite suppression on top of a 500-calorie diet drives intake to dangerous levels and compounds every risk the diet already carries.
Medically reviewed by
Chet Tharpe, MDBoard-certified physician
Last reviewed July 2026
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This content is for general informational purposes only and is not medical or nutritional advice, a diagnosis, or a substitute for professional judgment. It does not account for your health, medications, or goals, and nutrition information changes over time. Always talk with a qualified clinician or dietitian before making significant changes to your diet, supplements, or medications. Curex offers compounded GLP-1 medications through licensed clinicians and does not sell or endorse the food or supplement reviewed on this page.