Weight loss myths: the gelatin trick and 10 more, checked

Why weight loss myths spread so easily

Weight loss myths spread because they promise a quick, cheap and easy result to people who are tired of trying hard. A short video with a simple trick feels more hopeful than advice about meals, sleep and walking.

There is nothing foolish about being curious. Many people living with obesity have tried diet after diet and been judged for every one that did not last. When a trick promises to make it simpler, it is natural to want it to be true.

The trouble is that a trick can cost money, distract from what works, and sometimes harm your health. Researchers who reviewed popular beliefs about obesity found that many claims repeated in the media and even in scientific papers had no good evidence behind them, or were contradicted by the evidence.

On this page we check the biggest viral tricks first, then ten everyday weight loss myths. For each one you get three short parts: the myth, what the research says, and what to do instead.

We are not doctors, and this page is general information, not personal advice. Talk to your doctor first before you change the way you eat or start a new plan, especially if you have diabetes, kidney or heart disease, high blood pressure or take daily medicines.

Does the gelatin trick for weight loss work?

The gelatin trick is a viral habit of drinking or eating a small amount of gelatin before a meal so that you feel full sooner and eat less. It can add a little fullness, but it does not burn fat, it does not speed up your metabolism, and it is not a natural version of any medicine.

What the “jello” or “pink gelatin” trick usually contains

Versions shared online are usually based on gelatin powder dissolved in hot water. Some people use plain, unflavoured gelatin; others use a fruit-flavoured jelly mix, which is why the drink is sometimes pink. Lemon juice or apple cider vinegar is often added.

The drink is usually taken shortly before a meal, sometimes warm and sometimes set in the fridge as a jelly. We do not give a recipe here, because we do not want to suggest that this is a weight loss method we recommend.

Two practical points matter. Ready-made jelly mixes can contain a lot of sugar, and that adds energy rather than taking it away. Sugar-free mixes use sweeteners instead, which some people tolerate less well.

What the research on gelatin really shows

Gelatin is a protein made from collagen. Protein in general helps people feel full, and gelatin seemed to be a fairly filling protein in short laboratory studies.

In a Dutch study, 24 healthy young adults ate breakfasts made with different proteins. After a gelatin breakfast, they ate roughly a fifth less at lunch than after breakfasts made with casein, soy or one type of whey protein.

A follow-up study kept 23 people in a sealed metabolic room for 36 hours. On a diet where gelatin was the only protein, hunger was suppressed more than on a casein diet, at least when protein made up a modest share of the food. The energy the body burned was the same, so gelatin did not raise metabolism.

The same researchers point out that gelatin is an incomplete protein. It lacks some of the building blocks your body needs, so it cannot replace meals with eggs, beans, dairy, fish, meat or tofu.

What these studies do not show is lasting weight loss. They were short, they used healthy people with an average weight, and they studied gelatin as part of a meal, not as a drink taken before one. No good long-term trial shows that the gelatin trick leads to meaningful weight loss in people living with obesity.

Is gelatin a “natural GLP-1”?

No. GLP-1 is a gut hormone that your body releases after eating, and protein, fat and fibre all play a part. Eating gelatin may give a small, short rise, as many other foods do.

That food response is short-lived. It is part of how a protein-rich meal helps you feel satisfied, and an egg, a bowl of lentils or a pot of yoghurt does the same, with more nutrients than a gelatin drink.

Calling gelatin “nature’s Ozempic” mixes up a normal food effect with a prescription medicine, and no study has compared the two. The comparison is misleading, and it is used to make a cheap powder sound like something it is not.

Whether medication is right for you is something to discuss with your doctor. Obesity Foundation does not recommend or promote weight-loss medication; our focus is good food, appropriate exercise and walking.

What to do instead of the gelatin trick

If the idea behind the trick appeals to you, use the real principle: start your meals with foods that fill you up. A bowl of vegetable soup, a salad, a glass of water or a meal with a good portion of protein and vegetables does the same job with far more nutrition.

Gelatin desserts are fine as an occasional food if you enjoy them. Just do not use them to replace meals, and choose versions without much added sugar. If you live with diabetes, check the label and talk to your care team before adding anything new before meals.

Is baking soda safe for weight loss?

Baking soda does not help you lose fat, and drinking it in larger amounts can be dangerous. Some videos claim that a spoon of baking soda in water “alkalises” the body or melts belly fat. There is no evidence for either claim.

Baking soda is sodium bicarbonate. Your body keeps its acid level in a narrow range on its own, through the lungs and kidneys, whatever you eat or drink.

The US National Capital Poison Center explains that both the sodium and the bicarbonate can be toxic in large amounts. In the stomach, baking soda quickly releases carbon dioxide gas. After a large meal or heavy drinking, that gas pressure has, in rare cases, torn the stomach.

Doctors at the California Poison Control System reviewed 192 cases of people who became ill after using baking soda as a home remedy. More than half had symptoms serious enough to need a medical check. Twelve were admitted to hospital with problems such as disturbed salt levels, too little acid in the blood, or slowed breathing.

The poison centre doctors named pregnant women and young children among those at highest risk. The extra sodium is also a concern if you have heart failure, high blood pressure or kidney disease, so check with your doctor before using any sodium bicarbonate product.

What to do instead: leave baking soda in the kitchen cupboard for baking. If you get heartburn, ask a pharmacist about a suitable antacid. If you or someone else has swallowed a large amount and feels unwell, contact your local poison centre or emergency number straight away.

Liquid diets and cleanses: why they need medical supervision

A liquid diet replaces some or all meals with drinks such as juices, shakes or soups. Very-low-calorie liquid diets can lead to fast weight loss, but they should only be followed under the care of a doctor or specialist team.

There are two very different kinds of liquid diet. The first is a medical programme with nutritionally complete formula products, regular checks and a planned return to normal food. The second is a home-made juice fast or “cleanse” found online.

The medical kind can work. In the DiRECT trial in the UK, people with type 2 diabetes replaced their meals with formula drinks for three to five months, under close supervision from their family doctor’s practice.

After a year, almost half no longer had diabetes in the medical sense. Their diabetes and blood pressure medicines were stopped at the start under medical guidance, and practice nurses or dietitians supported them along the way.

That supervision is not a detail. Fast weight loss raises the risk of gallstones. In a Swedish study of more than 6,600 people in a weight loss programme, those on a very-low-calorie diet had about three times more gallstones needing hospital care than people on a moderate low-calorie diet. The risk was still low, but real.

Medicines for diabetes and blood pressure may need to change within days when you suddenly eat much less. Doing that without a doctor can cause low blood sugar or dizziness.

Juice-only plans have extra problems. They are low in protein, so you may lose muscle, and fruit juice is high in sugar while being far less filling than whole fruit. Most of the early weight drop is water, which returns quickly.

What to do instead: if you are interested in a formula diet, ask your doctor whether a supervised programme exists where you live and whether it suits you. For everyday weight loss, a steady pace is safer; our page on safe weight loss explains how fast is realistic.

10 more weight loss myths, checked against the evidence

The ten weight loss myths below come up again and again in conversations with the people we help. Some contain a grain of truth, and we say so where that is the case. None of them is a shortcut.

Myth 1: “Eating after 8 pm makes you fat”

The myth: food eaten late in the evening turns into fat, while the same food earlier in the day does not.

What the research says: there is a grain of truth. In a carefully controlled trial, adults living with overweight or obesity ate the same meals either early or about four hours later. On the late schedule they felt hungrier, their appetite hormones shifted, and they burned slightly less energy while awake.

But that trial lasted days, not months. The clock on the wall does not turn food into fat by itself. Late eating mainly becomes a problem when it adds extra food to the day, for example snacking in front of the television after a long, hungry afternoon.

What to do instead: eat regular meals so you are not starving by evening, and plan a filling dinner. If you like a set eating window, our page on intermittent fasting explains what the trials show and who should be careful.

Myth 2: “Carbs make you fat”

The myth: bread, potatoes, rice and pasta cause weight gain, and cutting carbohydrates is the only way to lose weight.

What the research says: in the DIETFITS trial, 609 adults followed either a healthy low-fat or a healthy low-carbohydrate diet for a year. Both groups lost a similar amount of weight, on average around 5 to 6 kg. Neither their genes nor their insulin levels predicted which diet would suit them better.

What both groups had in common was the advice to eat mostly whole, minimally processed food and plenty of vegetables, and to cut down on sugar and refined flour.

What to do instead: choose the kind of carbohydrate rather than fearing all of them. Whole grains, beans, lentils, fruit and potatoes in their skins fill you up. White bread, sweets and sugary drinks are easy to overeat. Our free eating plan shows how this looks on a plate.

Myth 3: “You can lose fat from one spot”

The myth: doing crunches burns belly fat, and arm exercises remove fat from the arms.

What the research says: exercising one muscle makes that muscle stronger, but the fat used for energy comes from stores all over the body. Where you lose fat first depends largely on your genes, sex and age, not on which muscle you train.

What to do instead: combine whole-body movement with better eating and sleep. Core exercises are still worth doing for your back and balance. Our page on how to lose belly fat explains what reduces the waist over time.

The same goes for face fat: a slimmer face follows overall fat loss, not face exercises.

Myth 4: “Skipping breakfast slows your metabolism”

The myth: breakfast “kick-starts” the metabolism, so you must eat it to lose weight.

What the research says: a review of randomised trials in the BMJ found that adding breakfast did not help people lose weight. People who ate breakfast actually ate somewhat more over the whole day. The trials were short and of mixed quality, so the honest answer is that breakfast is neither magic nor harmful.

What to do instead: eat breakfast if it keeps you from getting very hungry later, and skip it if you are simply not hungry in the morning. If you take insulin or tablets that can lower blood sugar, do not skip meals without talking to your doctor.

Myth 5: “Detox teas and cleanses flush out fat”

The myth: a tea, juice or powder cleans toxins out of your body and makes the weight fall off.

What the research says: a critical review of detox diets found no randomised trials showing that commercial detox programmes work in humans. Your liver and kidneys already clear waste around the clock.

Many “slimming” teas contain laxative herbs such as senna. You may feel lighter for a day, but you have lost water and the contents of your bowel, not fat. Using laxatives often can cause cramps, diarrhoea and dehydration, and may upset the body’s salt balance, so check the label and stop if you feel unwell.

What to do instead: drink water, plain tea or coffee, and eat enough vegetables, fruit and whole grains for regular digestion. Save the money for good food or a pair of walking shoes.

Myth 6: “Apple cider vinegar melts fat”

The myth: a shot of apple cider vinegar every morning makes you lose weight quickly.

What the research says: the study most often shared to support this claim, a trial in young people in Lebanon reporting large weight losses, has been retracted by the journal. After concerns about implausible values, the journal could not reproduce the results and found multiple errors.

Vinegar is an acid. Sipped undiluted or many times a day, it can irritate the throat and stomach and may wear down tooth enamel. If you have reflux or a sensitive stomach, it is best avoided as a drink.

What to do instead: enjoy vinegar as a salad dressing or in cooking if you like the taste. Do not expect it to change your weight.

Myth 7: “Some foods and pills burn fat”

The myth: chilli, grapefruit, green tea extract, “fat burner” capsules or special powders melt fat away.

What the research says: a large systematic review looked at 315 randomised trials of 14 types of supplement and alternative therapy for weight loss. Only a small share of the studies were of good quality, and few of those found a difference in weight. Where there was a difference, it was usually small.

Products sold as natural are not automatically safe. Some herbal capsules and powders can interact with medicines for blood pressure, blood sugar or blood thinning, and the label does not always tell the whole story.

What to do instead: no single food burns fat, but some foods help you eat well. Vegetables, beans, lentils, fruit, eggs, yoghurt and fish are filling for few calories; our page on foods for weight loss has more. If you want to try any supplement, show it to your doctor or pharmacist first.

Myth 8: “Exercise only counts if it is hard and sweaty”

The myth: unless you are out of breath and soaked in sweat, exercise is a waste of time.

What the research says: in a study of nearly 5,000 American adults aged 40 and over who wore step counters, people who took more steps a day had a much lower risk of dying over the next ten years. How fast they walked made no clear extra difference once the number of steps was taken into account.

For people with a heavier body, painful joints or no exercise history, very hard workouts also raise the risk of injury and of giving up.

What to do instead: start with movement you can repeat tomorrow. Our walking plan begins with a few minutes a day, and gentle workouts at Level Start can be done partly seated. Talk to your doctor first if you have heart, lung or joint problems.

Myth 9: “Snacking always leads to weight gain”

The myth: eating between meals is always bad for your weight.

What the research says: the review of obesity beliefs mentioned earlier classed the idea that snacking causes weight gain as a presumption, a belief without solid proof either way. What you snack on and how much probably matters more than whether you snack at all.

What to do instead: if a planned snack keeps you from arriving at dinner ravenous, it can help. Choose fruit, a handful of nuts, yoghurt or raw vegetables with hummus. Our page on healthy snacks has ideas. If you snack mostly when stressed, sad or bored, our guide to emotional eating may help more than any rule.

Myth 10: “Weight is only a matter of willpower”

The myth: people living with obesity just need to try harder and eat less.

What the research says: an international group of experts and medical societies agreed that this belief is wrong and harmful. Body weight is shaped by genes, hunger and fullness hormones, sleep, stress, medicines and a food environment full of cheap, tempting products.

Blame does not help either. The same experts found that weight stigma damages physical and mental health and makes people less likely to get good care.

What to do instead: treat yourself as you would treat a friend. Read about the real causes of obesity, and if comments about your body have hurt, our page on weight stigma explains why it is not your fault and what you can do.

How can you spot a weight loss myth?

You can check most viral weight loss claims yourself with a few simple questions. If the answer to several of them is yes, be careful.

• Does it promise fast results with no effort? Real changes in body fat take weeks and months.
• Does it rely on one food, drink or powder? No single item decides your weight.
• Is it compared with a medicine? Phrases such as “natural Ozempic” are marketing, not science.
• Is the proof mainly before-and-after photos or personal stories? Stories are not trials, and quick early losses are often water.
• Is someone selling something? Look for affiliate links, discount codes and “limited offers”.
• Does it tell you to stop eating meals or stop your medicines? That is a reason to talk to your doctor first, not to start.

A useful habit is to look for the original study. Ask how many people took part, how long it lasted, and whether they lived with obesity. A small study in healthy students over one afternoon tells you very little about lasting weight loss.

The same questions work for gadgets and therapies: see our checks of weight loss gadgets and hypnosis for weight loss.

Heard a claim that is not covered here? Our FAQ answers many more common questions.

What actually helps you lose weight

What helps you lose weight is a set of ordinary habits you can keep for years: filling meals, more daily movement, walking, enough sleep and support. They are slower than a viral trick promises, but they work, and they improve your health even before the scale moves.

Talk to your doctor first before you start any plan, especially if you take medicines for diabetes, blood pressure or your heart. Then build up one step at a time:

1. Fill half your plate with vegetables and add a protein food such as beans, eggs, fish, chicken, yoghurt or tofu at each meal.
2. Swap sugary drinks for water, plain tea or coffee.
3. Walk a little every day. Begin with five or ten minutes and add a few minutes each week.
4. Add gentle strength work twice a week, seated if you need to, to keep your muscles strong.
5. Protect your sleep with a regular bedtime and less screen time late at night.
6. Find support from friends, family, a group or a professional, so you are not doing it alone.

Our step-by-step guide on how to lose weight goes through each habit in detail, including what to do when progress stalls.

When to talk to a doctor

See a doctor before trying any trick or diet if you live with a long-term condition, and get help quickly if a trick has made you unwell. That includes:

• diabetes, especially if you use insulin or tablets that can cause low blood sugar
• kidney, liver or heart disease, or high blood pressure
• pregnancy or breastfeeding
• a history of an eating disorder
• any plan that replaces meals with drinks, or cuts food very sharply

Seek urgent care if you feel very unwell after taking baking soda, laxative teas or a supplement, for example with severe stomach pain, repeated vomiting, confusion or trouble breathing.

Fast weight loss raises the risk of gallstones. See a doctor promptly if you get strong pain in the upper right side of your belly, especially with fever or yellowing of the skin or eyes.

If you feel you have lost control around food, or you use cleanses or laxatives to make up for eating, please talk to your doctor. These are signs that you deserve support, not blame. Our doctor visit checklist helps you prepare for that conversation.

How Obesity Foundation helps you lose weight without tricks

Obesity Foundation is a non-profit, and all of our help is free. We help people lose weight with good food, suitable exercise and walking, not with powders, cleanses or shortcuts.

• Request your free eating plan with filling everyday meals and a shopping list.
• Get the free workout videos in three levels, starting gently and partly seated.
• Book a free video meeting (in English) to talk about a trick you have seen or where to begin.
• Join the free Obesity Foundation Club to track your walks and progress and get practical tips.

Our advice is general and does not replace your own doctor. When a new trick appears on your screen, you are always welcome to ask us what we know about it.