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Olive oil does not burn fat, and a spoonful drunk on its own adds calories to the day. A tablespoon carries about 120 calories, the same as mustard oil or ghee. Its value is as a swap. In long studies, people who used olive oil in place of butter, margarine and other added fats gained less weight over the years. A five-year Spanish trial found no extra weight on an olive-oil-rich diet that set no calorie limit. So olive oil can sit inside a weight-loss plan, measured by the same spoon as any other oil.
Use extra virgin olive oil for salads, dips and medium-heat cooking, and keep visible oil to a few teaspoons a day. Leave out the morning shot with lemon, which no trial has tested. When a measured diet still leaves the scale flat, the cause is usually somewhere else, and blood results show where.
Does olive oil help you lose weight?
No single food takes weight off. The research suggests something smaller: olive oil adds less weight over time than the fats it usually replaces. The largest look at this comes from Harvard. Guasch-Ferré and colleagues followed 121,119 American nurses and health professionals for up to 25 years, asking about their food every four years.
Each extra half tablespoon of olive oil a day went with slightly less weight gain over the next four years, about 0.09 kg. The same extra amount of butter, margarine or other vegetable oils went with slightly more. When the researchers modelled swapping those fats for equal amounts of olive oil, the swap was linked with less gain.
Spain points the same way. In the SUN study of 7,368 university graduates, Bes-Rastrollo's team found that the heaviest olive oil users, at a median of 46 g a day, did not gain more weight than the lightest users. Over about two and a half years their gain was, if anything, a fraction lower.
Both are observational studies. People who choose olive oil may also eat more vegetables, walk more or smoke less, and statistics can only partly adjust for that. Read them as reassurance that olive oil does not make weight harder to lose, rather than proof that it melts fat.
What happened when olive oil was tested in a trial?
The best trial is PREDIMED, run in primary care centres across Spain. Its 7,447 older adults had type 2 diabetes or several heart risk factors, and most were overweight. They were randomly given a Mediterranean diet with extra virgin olive oil, the same diet with nuts, or advice to cut fat. Nobody was told to eat less or exercise more.
After five years, Estruch and colleagues reported that the olive oil group weighed about 0.4 kg less than the low-fat group, a gap too small to be sure of. Waists grew slightly in all three groups. The nut group gained less around the middle than the low-fat group; the olive oil group's smaller gain was within chance. Plenty of oil, with no calorie count, did not add weight.
A much smaller experiment hints at why the type of fat might matter. Piers and colleagues in Melbourne gave eight overweight men two diets for four weeks each. One was rich in saturated fat, the kind in butter, cream and fatty meat. The other used mostly monounsaturated fat, the main fat in olive oil.
The men ended the monounsaturated month 2.1 kg lighter, with 2.6 kg less fat, though their measured intake and energy use did not differ. Eight men over a month is a thin base. Larger studies since then show small differences between fats at best, so treat this as a curiosity rather than a reason to change oils.
Is olive oil better for weight than mustard, groundnut or sesame oil?
Probably not by much, and the Indian oils hold up well. Abdollahi and colleagues pooled 42 randomised trials of edible oils and body weight in a network analysis, which lets oils be compared even when no trial put them head to head. Sesame oil ranked highest for lowering weight, followed by a mix of canola and sesame.
Soybean, palm and sunflower oil ranked lowest and were linked with some weight gain. The authors rated the certainty as low to moderate, which means the ranking could change with better trials. Olive oil sat in the middle. For a kitchen that already uses til oil in the south or mustard oil in the east, there is no weight case for switching.
A second review, by Santos and colleagues, gathered 52 trials that compared olive oil with other oils and measured body fat. Used in cooking, olive oil did not change where fat sat on the body. Taken as capsules on top of the usual diet, it went with a slightly larger waist.
So pick oils for taste, cooking method and heart health, and rotate them through the week if you like. A family that cuts its daily oil from six tablespoons to three saves far more calories than one that swaps mustard oil for olive oil.
Should you drink olive oil, or take it with lemon in the morning?
This is the advice most likely to reach you on WhatsApp: a tablespoon of olive oil with lemon juice on an empty stomach to flush fat. No randomised trial has tested this drink for weight loss. The claims usually join two separate ideas, that olive oil fat is healthy and that lemon has vitamin C, and present the mix as a fat burner.
The arithmetic runs the other way. A daily tablespoon adds about 120 calories, roughly a small roti's worth, on top of everything else you eat. Over a month that is about 3,600 calories with nothing taken out to make room. The capsule trials in the Santos review, where olive oil was added rather than swapped, are the closest test, and waists grew a little.
If you enjoy the ritual, keep the lemon and warm water and drop the oil. Use the spoon of olive oil on your lunch salad or in the evening sabzi instead, where it replaces something rather than adding to it. Some people find a little fat with a meal keeps them full longer, and that is a far better use of the same 120 calories.
Sources: [6]
Which olive oil should you buy in India?
Indian shelves carry three main kinds, and the labels are easy to misread. Extra virgin olive oil is pressed from the fruit without chemical refining. It keeps the peppery, grassy taste and most of the plant compounds called polyphenols. This is the oil used in PREDIMED.
Bottles marked pure, classic or light are mostly refined olive oil with a little virgin oil blended in. Light refers to colour and flavour; the calories are the same. Olive pomace oil, often sold in India for Indian cooking, is extracted with solvents from the paste left after pressing and then refined. It is a reasonable cooking fat, but most of what makes olive oil interesting has been removed.
The health case for olive oil is strongest when it replaces animal fats. In another Harvard analysis, Guasch-Ferré's team linked more than half a tablespoon a day with lower death rates over 28 years than rarely using it. Swapping it for margarine, butter, mayonnaise or dairy fat went with lower risk. Against other vegetable oils combined, the difference disappeared.
For weight loss, then, buy the oil you will actually use and measure. A small bottle of extra virgin for salads and finishing, alongside your usual mustard, groundnut or rice bran oil for everyday cooking, covers most kitchens.
Can you cook Indian food in olive oil?
Yes, most of it. Bhindi, a dal tadka, poha or upma cook well in extra virgin olive oil on a medium flame. If the oil starts to smoke, the pan is too hot, so turn it down. The taste is stronger than groundnut oil, which suits some dishes and clashes with others. Many families end up using it for vegetables and eggs and keeping mustard oil for fish and pickles. Refined or pomace olive oil handles higher heat but tastes of very little.
Deep frying is where weight comes in, whatever the oil. In the same Spanish SUN cohort, Sayon-Orea and colleagues followed 9,850 adults for about six years. Among those who started at a healthy weight, people eating fried food more than four times a week had 37% higher odds of becoming overweight than those eating it less than twice a week.
Puris, pakoras and samosas fried in olive oil take up as much fat as those fried in anything else. Keep them for festivals and guests. For everyday tikkis and cutlets, an air fryer or a shallow fry in a teaspoon or two does the job.
Sources: [8]
How much olive oil a day fits a weight-loss plan?
Count all visible oil together, olive or otherwise. The World Health Organization advises keeping total fat to about 30% of daily energy or less, with saturated fat under 10%. On a 1,500-calorie weight-loss day that is about 50 g of fat in total, and milk, curd, paneer, nuts and eggs already supply a good share of it.
As a general guide, three to five teaspoons of visible oil per person a day leaves room for everything else. A teaspoon holds about 40 calories. A family of four cooking with six tablespoons a day is using about one and a half tablespoons each, roughly 180 calories per person, before anyone has eaten a vegetable.
A few kitchen habits help. Measure oil into the pan with a teaspoon for a week instead of pouring from the bottle. Use a non-stick or cast-iron pan and add a splash of water when the masala sticks. Dress salads with one teaspoon of extra virgin and plenty of lemon, salt and pepper, which goes further than you would expect.
Sources: [9]
Why can weight stall even after the oil is sorted?
Measuring oil is often the first change that works. Going from six tablespoons a day in the family pot to about three teaspoons each saves a few hundred calories, and nobody at the table has to eat one roti less. Most people see the scale move for a couple of months. Then it slows, for ordinary reasons. A smaller body needs less food, so the gap narrows by itself. The rice katori quietly grows back. A salty dinner holds water and hides a week of fat loss.
Muscle is the reason people rarely think of. If calories fall while protein stays low and the only lifting is the shopping bag, part of the weight lost is lean tissue. Weinheimer pooled 52 studies in adults over 50. In 81% of the diet-only groups, at least 15% of the weight lost was fat-free mass; with exercise added, the figure was 39%. A body with less muscle burns less each day.
After the oil, then, look at protein and strength work. A katori of dal, some paneer, curd or two eggs at each meal, and two short sessions of squats and rows a week, go a long way. If the stall drags on for a month or more, sugar, insulin and thyroid are worth a look. At Metaboliq a doctor reads those from a home blood test before the plan is written, and oil, protein and training are set together. The aim is to lose up to 20% of body weight and keep your muscle while you do it.
Sources: [10]