Crash Diets, Detoxes and Cleanses: What to Avoid and Why
Juice cleanses, cabbage soup, laxative teas and HCG drops. What they really do, and how to spot a bad diet before you spend a dollar.
The short version
- Crash diets mostly take off water and muscle along with some fat, and they're tough to maintain.
- Your liver and kidneys already detox your body. No juice or tea does that job.
- HCG weight-loss products sold over the counter are illegal, and laxatives don't remove fat.
- Learn the red flags below. They'll save you money and possibly your health.
What crash diets actually do
Eat 500 to 800 calories a day and you'll lose weight quickly. You'll also lose a lot of water and more muscle than you would otherwise. When you start eating again, the water returns right away and the rest often comes back too, leaving you with less muscle than when you started.
Side effects can include fatigue, dizziness, constipation, hair loss, irregular periods, gallstones, and, at the extreme, dangerous heart rhythm problems. Medically supervised low-calorie programs exist and are quite different, because they're nutritionally complete and monitored.
The usual suspects
| Diet | The claim | The reality |
|---|---|---|
| Juice cleanses | Flush toxins, reset your body | Low in protein and fiber, high in sugar. Your weight loss is mostly water |
| Master Cleanse | Lemon water, maple syrup and cayenne | A starvation diet, with no special properties |
| Cabbage soup, grapefruit, "military" diets | 10 pounds in a week | Very low calories for a short time, then regain |
| Detox teas | Flatten your stomach | Usually laxatives. They cause water loss and cramps, not fat loss |
| Colon cleanses | Remove built-up waste | No benefit shown, and they can cause dehydration or injury |
| HCG drops and injections | Lose a pound a day | The FDA says over-the-counter HCG products for weight loss are illegal. Any loss comes from the 500-calorie diet attached to them |
Do you need to detox?
No. Your liver, kidneys, gut and lungs clear waste products continuously. If they stopped working, you'd need a hospital, not a juice. Research hasn't shown that detox products remove anything meaningful, and some have caused harm, including kidney problems from high-oxalate juices.
Red flags in any diet or product
The Federal Trade Commission calls claims like these untrue: losing weight without diet or exercise, losing 30 pounds in 30 days, or losing weight with a patch or cream. It also says products promising lightning-fast weight loss are always a scam. Watch for:
- Results that sound too fast or too easy
- Something "doctors don't want you to know"
- Banning entire food groups without a medical reason
- A product or subscription you have to buy
- Before-and-after photos in place of research
- Celebrity or influencer endorsements
- Claims of "melting," "burning" or "blasting" fat
If you need quick results
Got an event coming up? The honest answer is that you can reduce bloating in a week or two by cutting sodium, alcohol and very large meals, walking daily and getting more sleep. You'll look and feel better, without harming yourself. For real, lasting weight loss, start with the first 30 days.
Sources
This guide is general information, not medical advice. Please check with a clinician before making big changes, especially if you have a health condition, take medication, or are pregnant. Read the full disclaimer.
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