You may have heard that you should avoid certain foods at all costs.

However, this type of advice sometimes stems from outdated research or studies that are too small to be significant.

In fact, some foods that people often consider unhealthy can offer health benefits if you consume them in moderation.

This article looks at 11 demonized foods that may be good for you.

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1. Whole eggs

The nutrients in eggs may make them one of the healthiest foods you can eat.

For years, experts advised people not to eat whole eggs because the yolk was high in cholesterol. At the time, some believed eating egg yolks could raise blood cholesterol and increase the risk of heart disease.

However, it now seems that when you eat high cholesterol foods like eggs, your liver produces less cholesterol to compensate. In most cases, blood cholesterol levels remain fairly stable

In fact, whole eggs may help protect your heart health by changing the size and shape of LDL (bad) cholesterol. At the same time, HDL (good) cholesterol levels and insulin sensitivity increase.

In a 12-week study in people with metabolic syndrome, the group that consumed whole eggs experienced greater improvements in heart health markers than the egg white group. They also had greater reductions in insulin levels and insulin resistance.

Eggs also contain easily digested, high quality protein. They can help you stay full and satisfied for hours so that you consume fewer calories later in the day.

Egg yolks are also high in lutein and zeaxanthin. These may help protect against common age-related eye diseases, such as cataracts and macular degeneration .

Summary Rather than increasing heart disease risk, eggs may benefit the heart. Eating eggs may also help lower blood sugar and insulin levels, decrease hunger, and protect eye health.

2. Coconut oil

In the past, food manufacturers commonly used coconut oil in packaged foods and food preparation.

However, there was concern that the saturated fat in coconut oil might cause heart disease. As a result, manufacturers started replacing coconut oil with other vegetable oils, including partially hydrogenated vegetable oils.

However, some research has suggested the type of saturated fat found in coconut oil may benefit the heart.

For example, there’s evidence that it may increase levels of HDL (good) cholesterol more than those of LDL (bad) cholesterol, leading to a healthier ratio of these values (12Trusted Source, 13Trusted Source).

Also, coconut oil may promote weight loss when consumed in moderate amounts.

Coconut oil contains medium-chain triglycerides (MCTs). The liver takes up MCTs directly for use as energy. Animal research suggests the body may be less likely to store MCTs as fat, compared with longer-chain fats (14Trusted Source).

MCTs can also help reduce hunger and promote fullness. This can make you less likely to overeat and decrease your calorie intake. They may also increase your body’s metabolic rate more than other fats, according to some studies (15Trusted Source, 16Trusted Source, 17Trusted Source).

In one study in 80 healthy young men, taking 15–30 grams of MCTs (about 2–3 tablespoons of coconut oil) daily appeared to increase the number of calories they burned by an average of 120 per day (18Trusted Source).

Indeed, some small studies suggest that adding coconut oil to your diet helps you lose weight and belly fat (19Trusted Source, 20Trusted Source).

However, whether coconut oil and saturated fats are healthy remains a controversialpl;an topic. Nutritionists disagree on the effects of fat and how much a person should consume.

The American Heart Association (AHA) points out that, unlike some saturated fats, coconut oil does not contain cholesterol. However, they advise people to limit their overall intake of saturated fat to a maximum of 120 calories a day, or 5–6% of their daily calories. (21).

It’s best to consume any fat in moderation.

Summary Coconut oil contains medium-chain triglycerides, which may help protect heart health, suppress appetite, increase metabolic rate, and promote weight loss.

3. Full fat dairy

Cheese, butter, and cream are high in saturated fat and cholesterol.

However, studies indicate that fermented, high fat dairy foods like cheese don’t negatively affect cholesterol and other heart health markers — even in people with high cholesterol levels or increased heart disease risk (22Trusted Source, 23Trusted Source, 24Trusted Source, 25Trusted Source).

Butter intake, on the other hand, can raise LDL (bad) cholesterol and may increase the risk of heart disease (26Trusted Source, 27Trusted Source).

Many people consume only low fat and fat-free dairy products. However, these products lack some of the health-promoting qualities of full fat varieties.

For instance, only full fat dairy contains vitamin K2, which helps protect heart and bone health by keeping calcium in your bones and out of your arteries (28Trusted Source, 29Trusted Source, 30Trusted Source).

Full fat dairy products also contain conjugated linoleic acid (CLA). One review of several studies found that CLA supplements may help promote fat loss (31Trusted Source).

However, full fat dairy products can be high in calories and saturated animal fats. People should consume them in moderation.

Summary Dairy intake may protect heart and bone health and decrease the loss of muscle mass and strength during aging. Full fat dairy may provide additional benefits like vitamin K2.

4. Legumes

Legumes include beans, lentils, peas, and peanuts. They’re rich in protein, minerals, and fiber.

However, some people believe they’re unhealthy. This is because they contain phytates and other antinutrients that prevent the body from absorbing minerals like zinc and iron.

This only seems to be a concern for people who don’t eat meat, poultry, and fish. Those who consume meat absorb enough of these minerals from animal foods, and legumes don’t inhibit their absorption (32Trusted Source, 33Trusted Source).

At any rate, there are ways to reduce the antinutrients in healthy plant foods.

Legumes are also rich in potassium, magnesium, and other minerals. Several studies have found they reduce inflammation, decrease blood sugar and promote heart health (34Trusted Source, 35Trusted Source, 36Trusted Source, 37Trusted Source).

What’s more, beans are an excellent source of fiber, including soluble fiber. Studies suggest soluble fiber may reduce appetite, promote fullness, and decrease calorie absorption from meals (38Trusted Source, 39Trusted Source).

Summary Phytates and other antinutrients in legumes pose little concern for people eating a balanced diet. Studies suggest that legumes may reduce inflammation and promote heart health and weight loss.

5. Unprocessed meat

There’s some evidence that both processed and unprocessed red meat may increase the risk of heart disease, colorectal cancer, and other diseases (40Trusted Source, 41Trusted Source).

However, unprocessed meat is an excellent source of high quality protein. It has been an important part of the human diet and may be what allowed humans to develop larger, more complex brains at a time when high quality plant-based foods were not available (42Trusted Source, 43Trusted Source).

Animal protein, including meat, may improve muscle function. A study in older women who ate lean beef found increased muscle mass and strength.

It also observed reductions in some inflammatory markers, although some studies have linked red meat intake to higher levels of inflammation (44, 45Trusted Source, 46Trusted Source, 47Trusted Source, 48Trusted Source).

Meat is also one of the best sources of heme iron. Your body absorbs this type of iron most easily (49Trusted Source).

Overall, grass-fed meat seems to be the healthiest option. It contains more CLA than grain-fed meat, as well as more omega-3 fatty acids (50Trusted Source, 51Trusted Source, 52).

When eaten in moderation, meat can provide essential nutrients. However, take care not to overcook it, as charred and overcooked meat may be harmful to your health.

Summary When eaten in moderation, unprocessed and properly cooked red meat is an excellent source of high quality protein, iron, and other nutrients.

6. Coffee

Coffee contains caffeine, a potent stimulant. In high doses, caffeine can have adverse effects.

However, unless you have a sensitivity to caffeine, consuming it or coffee in moderation may provide a number of health benefits.

Studies indicate that the caffeine in coffee can improve mood, as well as mental and physical performance. It may likewise boost your metabolism (53Trusted Source, 54, 55, 56, 57Trusted Source).

Coffee also contains antioxidants called polyphenols, which may reduce disease risk.

People use caffeine to relieve headaches and enhance performance in endurance sports. It may also help with depression, Alzheimer’s, and Parkinson’s disease (58Trusted Source).

In one study, men who consumed coffee bean polyphenols before a meal had significant improvements in artery function, compared with a control group (58Trusted Source, 59Trusted Source).

In an observational study including over 1,700 men, those who drank more than 2.5 cups of coffee per day had lower levels of several inflammatory markers than those who didn’t drink coffee (55Trusted Source).

Furthermore, people who drink either regular or decaffeinated coffee may have a lower risk of type 2 diabetes. Scientists who analyzed 28 studies found an 8–33% lower risk of type 2 diabetes among people who drank coffee every day (56Trusted Source, 57).

Finally, coffee may also have a protective effect on liver health. It may slow the progression of chronic hepatitis C and reduce liver cancer risk (58Trusted Source, 59Trusted Source, 60).

Summary Regular coffee intake may improve mental and physical performance, boost metabolic rate, and reduce inflammation and the risk of several diseases.

7. Canned and frozen vegetables

People often consider canned and frozen vegetables to be less nutritious than fresh vegetables. However, unless you pick and eat vegetables directly from your garden, this may not be true.

Research shows that canning and freezing vegetables while they’re fresh retains most of their nutrients. In contrast, fresh foods can lose nutritional value on the way to the grocery store. Preserving also results in less waste and less expensive products (61).

One study analyzed the vitamin C content in peas and broccoli that had been frozen for 12 months. It was similar to that of vegetables purchased at the grocery store and higher than that of vegetables stored at home for several days (62).

Blanching, or quickly boiling, kills bacteria and helps keep the colors and flavors of vegetables intact. However, blanching vegetables before freezing or canning can result in a loss of vitamins C and B and their antioxidant capacity (63).

However, very little further loss occurs after the vegetables are frozen or canned (63, 64).

On the other hand, vitamins A and E, minerals, and fiber are retained during the blanching process because they’re more stable in water. Therefore, levels of these nutrients in fresh, frozen, and canned vegetables are similar (65).

Summary Some water-soluble vitamins and antioxidants may be higher in fresh produce, especially if you eat it straight from the garden. Overall, however, the nutrient content of canned and frozen vegetables is comparable to that of fresh.