Cholesterol: Food Against Blood Levels, Eggs and Prawns, and What Indian Surveys Show

Cholesterol is a waxy lipid found in every cell of the body. The liver makes all that is needed, and animal foods add more; plants contain none. The cholesterol you eat and the cholesterol on a blood report are related but not the same thing: ICMR-NIN ties blood LDL cholesterol to saturated fat, trans fat and body weight, and feeding trials find that cholesterol in food moves it only modestly. No Indian guideline sets a daily amount to eat. In ICMR-INDIAB's first phase, 13.9 per cent of adults had high total cholesterol and 72.3 per cent had low HDL. This entry is part of the fats section of the handbook.

What is cholesterol, and what does the body use it for?

It is a structural fat, not a fuel. ICMR-NIN's 2024 guidelines describe its part in keeping cell membranes fluid and permeable, and name it as the starting material for many hormones and for vitamin D. The same document says the liver builds cholesterol from the carbohydrate and fat in the diet, makes more when little is eaten and less when more is eaten. That feedback is the reason a food's cholesterol content and your blood result do not move in step.

Cholesterol does not dissolve in blood, so it travels inside carrier particles called lipoproteins. Low-density lipoprotein, LDL, carries it out to the tissues; ICMR-NIN notes that high blood LDL cholesterol leads to lipid building up in cells and to atherogenic effects. High-density lipoprotein, HDL, carries surplus cholesterol back to the liver for disposal. A blood report measures the cholesterol riding in each kind of particle, which is why it speaks of LDL cholesterol and HDL cholesterol and not of two different substances.

Is cholesterol in food the same as cholesterol in blood?

No. Dietary cholesterol is a quantity in milligrams that you swallow, found only in foods of animal origin. Blood cholesterol is a concentration in milligrams per decilitre, set largely by how much the liver makes and clears. When trials feed people extra cholesterol, blood levels rise a little: a 2019 analysis of 55 feeding studies with 2,652 subjects estimated that 100 mg more a day raises LDL cholesterol by 1.9 to 4.6 mg/dl, depending on the model used. That is a real effect and a small one.

How much dietary cholesterol do the guidelines allow?

None of the documents opened for this entry gives a daily number. ICMR-NIN's 2024 guidelines set no figure for cholesterol; they ask you to limit saturated fat, avoid trans fat and keep visible fat moderate. The American Heart Association's 2019 science advisory records that recent guidelines have dropped specific cholesterol targets and argues that advice should rest on whole dietary patterns, which are low in cholesterol anyway. The 2020 to 2025 Dietary Guidelines for Americans repeat a National Academies line: keep dietary cholesterol as low as possible without harming the nutritional adequacy of the diet.

The absence of a number is not permission. It reflects a judgement that counting milligrams helped people less than changing the fats they cook with. The companion entries on saturated fat and trans fat cover the two fats that ICMR-NIN links most directly with blood lipids.

Which Indian foods contain cholesterol?

Eggs, liver and squid carry the most; ordinary fish, chicken and mutton carry moderate amounts; cereals, pulses, vegetables, fruit, nuts and every vegetable oil carry none. The table gives values from the Indian Food Composition Tables 2017 beside saturated fat, because the two do not travel together. The full ranking is on the cholesterol food table, and the pages for egg per 100 g and prawns per 100 g have the complete panels.

Prawns show why one column is not enough. A 100 g portion has about as much cholesterol as mutton and almost no saturated fat, while hilsa matches them on cholesterol and carries a hundred times the saturated fat of prawns. The site's food tables hold no cholesterol value for milk, paneer or ghee, so none is quoted here; ICMR-NIN lists butter, ghee, whole milk, cream, fatty cheese and fatty meats as sources of both cholesterol and saturated fat. The comparison of egg white and whole egg shows where an egg's share sits.

LDL, HDL and the lipid profile: tests a doctor orders

The test is called a lipid profile. It reports total cholesterol, HDL cholesterol, LDL cholesterol and triglycerides, and the ICMR-INDIAB survey also used the ratio of total to HDL cholesterol. In that survey the blood was a fasting venous sample, and LDL cholesterol was not measured directly but calculated with the Friedewald equation. The fourth number has its own entry, triglycerides.

What the numbers mean for you is a clinical judgement. The same LDL figure can be acceptable for one person and too high for another, depending on age, diabetes, blood pressure, smoking, family history and whether there is existing heart disease. This handbook therefore gives no personal targets. A report marked high or low against the laboratory's printed range is a reason to see your doctor, not a diagnosis.

Cholesterol in Indian blood reports: what ICMR-INDIAB found

The first phase of the ICMR-INDIAB study, published in 2014, sampled adults aged 20 and over in Tamil Nadu, Maharashtra, Jharkhand and Chandigarh and ran lipids on every fifth participant, 2,042 people. Using the cut-offs of the American National Cholesterol Education Programme, 79 per cent had at least one abnormal value. The pattern was not mainly high cholesterol. Low HDL was the commonest finding by a wide margin, and in 44.9 per cent of subjects it was the only one.

Regions differed: high total cholesterol was most frequent in Tamil Nadu at 18.3 per cent, and urban residents generally fared worse than rural ones. The completed national study, reported in 2023 from 31 states and territories, put the weighted prevalence of dyslipidaemia at 81.2 per cent. Children are not exempt. The Comprehensive National Nutrition Survey, as tabulated in ICMR-NIN's 2024 guidelines, found high total cholesterol in 3.2 per cent of children aged 5 to 9 and 3.7 per cent of those aged 10 to 19.

Does cholesterol in food raise blood cholesterol, or is it the fat?

Both do, and the Indian guidelines put the weight on the fat. ICMR-NIN states that saturated fatty acids raise serum total and LDL cholesterol, and that trans fat disturbs the lipid profile. For cholesterol itself, a 2015 systematic review of 19 trials found that adding it to the diet raised total cholesterol by 11.2 mg/dl and LDL cholesterol by 6.7 mg/dl on average, and HDL cholesterol by 3.2 mg/dl. The rise in LDL was no longer statistically significant at doses above 900 mg a day, and the authors judged the studies too mixed and too weak to settle the effect on heart disease.

What does the evidence say about eggs and the heart?

Most large studies find no link at up to one egg a day, and one finds a small one. A 2020 analysis in The BMJ followed three American cohorts for up to 32 years and added a meta-analysis of 1,720,108 participants: one more egg a day was not associated with cardiovascular disease, with a pooled relative risk of 0.98, and in Asian cohorts the association was slightly protective at 0.92. The PURE study, which followed 146,011 people in 21 countries, found no significant association between seven or more eggs a week and blood lipids, deaths or major cardiovascular events.

The dissent comes from a pooled analysis of six American cohorts and 29,615 adults published in JAMA in 2019. Each extra 300 mg of dietary cholesterol a day was associated with a 17 per cent higher risk of cardiovascular disease, and each extra half egg with a 6 per cent higher risk; the egg effect disappeared once cholesterol intake was accounted for. All of these are observational studies of people reporting their own diets, and what is eaten with the egg differs from country to country.

A worked example: counting a day in Kolkata

This is an illustration, not a real person. Take a 45-year-old bank clerk in Kolkata who eats two boiled eggs at breakfast, 100 g of prawns in a curry at lunch and 100 g of rohu at dinner. Taking each egg as 50 g, the eggs supply 366 mg of cholesterol, the prawns 87 mg and the rohu 48 mg: 501 mg for the day. From those three foods the saturated fat is 2.96 + 0.09 + 2.05 = 5.1 g.

Now add what the table leaves out. Three teaspoons of ghee, 15 g, bring about 10.7 g of saturated fat, since ghee is 71 per cent saturated in the Indian tables: twice the saturated fat of the eggs, prawns and fish together. If he wants to change one thing, the arithmetic points at the ghee before the prawns. Whether his own blood report calls for any change at all is his doctor's call.

Common mistakes and myths about cholesterol

On packaged food the claim is regulated. FSSAI allows "cholesterol free" only at 5 mg or less per 100 g, and "low cholesterol" at 20 mg or less per 100 g of a solid food, and in both cases the food must also stay within 1.5 g of saturated fat per 100 g. A second mistake is to read only total cholesterol on a report: the Indian survey data show that the usual problem is low HDL and high triglycerides. The site's Indian diet chart for cholesterol turns the food advice into meals.

Too much in the blood: risk, and when to see a doctor

A lipid abnormality is found by a blood test, not by how you feel. See your doctor about a lipid profile if a parent, brother or sister had heart disease or a stroke early, if you have diabetes, high blood pressure or obesity, or if an earlier report was abnormal. Nothing in this entry is advice about cholesterol-lowering medicines. Do not start, stop, skip or change the dose of any such medicine because of a diet change or something you have read; that decision is made with the prescribing doctor.

One product class carries a legal caution worth knowing. Foods with added plant sterols or stanols, sold for lowering cholesterol, must by FSSAI's labelling regulations state that patients on cholesterol-lowering medication should use the product under medical supervision, and that it may not be nutritionally appropriate for pregnant and lactating women and children under five.

Learning this properly

Blood lipids sit on the boundary between food advice and medicine, and knowing which side a question falls on is a skill in itself. NNWA is a private academy in Kolkata teaching skill courses online, in English and Hindi. Its students learn to coach healthy people and to send anything medical to a doctor; no course it offers is a degree or qualifies anyone as a dietitian. The Certification in Nutrition covers fats and labels, and Clinical Nutrition and Dietetics covers diet alongside medical care.