Most of us grew up with a mental list of things we were told to stop doing. Stop cracking your knuckles. Skip the coffee. Don’t nap in the afternoon. Never touch the egg yolk.
Nutrition and medical science rarely stand still, though. Several habits long treated as small sins turn out to be harmless, and a few may help. Here are ten worth a second look, along with the caveats that keep this from becoming permission to do whatever you like.
1. Drinking Coffee Every Day
Coffee’s reputation as a vice has softened considerably. Large reviews of the research link moderate daily consumption, roughly three to four cups, with a lower risk of type 2 diabetes, certain liver diseases and Parkinson’s disease. The drink is also a major source of antioxidants in many people’s diets.
The caveats are real. Caffeine can disrupt sleep if you drink it late in the day, and it can aggravate anxiety or heart palpitations in sensitive people. Pregnant women are generally advised to limit their intake. And the benefits belong to coffee, not to the syrup and whipped cream layered on top of it.
2. Taking a Midday Nap
Napping is often dismissed as laziness, but a short nap of 10 to 30 minutes can sharpen alertness, improve mood and support memory and performance. Pilots, shift workers and surgeons have long used strategic rest to stay sharp.
Timing and length matter. Sleep much longer than half an hour and you may wake up groggy. Nap too late in the day and you risk wrecking your night’s sleep. If you regularly need long naps to function, that is worth raising with a doctor.
3. Eating Eggs
Eggs spent years under suspicion because of their cholesterol content. Scientists now understand that, for most healthy people, the cholesterol you eat has a much smaller effect on blood cholesterol than the saturated and trans fats in your diet.
Meanwhile, eggs deliver high-quality protein, choline, which supports brain function, and a range of vitamins and minerals, all at a modest calorie cost. They are also filling, which can help with appetite control. People with diabetes or existing heart disease should still ask their doctor how many are right for them, and what you serve alongside eggs, such as processed meats, changes the picture considerably.
4. Snacking on Nuts
Nuts are calorie-dense, which once earned them a place on many “avoid” lists. Yet people who eat a handful most days tend to have better heart health and a lower risk of several chronic conditions. Nuts supply unsaturated fats, fiber, protein and plant compounds that appear to benefit blood vessels.
They also keep hunger at bay. In practice, people who eat nuts regularly do not gain weight at the rate their calorie count would suggest, partly because they eat less of other things. A small handful, about an ounce, is a sensible serving. Choose unsalted or lightly salted varieties, and skip anyone with an allergy.
5. Enjoying Dark Chocolate
Chocolate is not a health food, but dark chocolate, particularly varieties with a high cocoa content, contains flavanols that appear to support healthy blood flow and may modestly lower blood pressure. It also offers magnesium and fiber.
The key is restraint and quality. A small square or two a day fits comfortably into most diets. A king-size bar of sugary milk chocolate does not. Check the label: the shorter the ingredient list and the less added sugar, the better.
6. Cracking Your Knuckles
Generations of parents warned that cracking knuckles would lead to arthritis. The evidence does not back that up. Studies comparing habitual crackers with non-crackers have not found a higher rate of arthritis in the joints involved.
The popping sound comes from gas bubbles shifting in the fluid that lubricates the joint, not from bones grinding together. It may annoy people sitting next to you, but if it is painless, it is generally harmless. Pain or swelling when you crack a joint is a different matter and deserves a medical opinion.
7. Letting Your Mind Wander
In an age of productivity apps, daydreaming feels like wasted time. Neuroscience suggests otherwise. When your mind drifts, the brain’s default network switches on, helping to consolidate memories, process emotions and connect ideas that seem unrelated. Many people report their best insights arriving in the shower or on a walk, not at a desk.
Giving yourself unstructured moments, without a phone in hand, can reduce stress and boost creative problem-solving. Think of it as maintenance time for your attention span.
8. Taking Rest Days From Exercise
Fitness culture often treats a missed workout as a failure. In reality, muscles get stronger during recovery, not during the session itself. Rest days give tissue time to repair, lower the risk of overuse injuries and help prevent the burnout that causes many people to quit exercising altogether.
Rest does not have to mean doing nothing. Gentle walking, stretching or an easy swim keeps blood moving without taxing the body. If you feel persistently exhausted, notice your performance slipping or find yourself dreading every session, those are signals your schedule needs more recovery, not more willpower.
9. Getting a Little Dirty
An obsession with sterile surroundings may do more harm than good. Researchers have long explored the idea that early and regular contact with a diverse range of microbes helps train the immune system. Children who spend time outdoors, play in soil and grow up around animals tend to show lower rates of some allergies and immune-related conditions.
This is not an argument against washing your hands before meals or after using the bathroom, which remains one of the most effective ways to prevent infection. It is an argument for gardening without gloves, letting kids play in the park and not panicking over every speck of dust.
10. Swearing When You’re Hurt
Here is one your grandmother probably would not approve of. Small experiments have found that people who let loose a curse word while holding their hand in cold water were able to tolerate the pain for longer than those who repeated a neutral word. Swearing may also give a short-term boost in physical strength.
Researchers believe strong language triggers an emotional response that dampens the perception of pain. This is not a license to be rude in the office. But if you stub your toe, a well-placed expletive may do a little more than release frustration.
Context Is Everything
What ties these habits together is a simple principle: very little in health is purely good or purely bad. Dose, timing and individual circumstances matter enormously. Coffee that helps one person’s focus keeps another awake until dawn. A nap that restores one worker leaves another sluggish. An egg a day may be fine for you and a concern for someone with specific medical conditions.
It is also worth remembering that nutrition and health science evolves. Advice that seemed firm a generation ago has been revised more than once, and it will be again. The sensible approach is to treat headlines with healthy skepticism, favor balance over extremes and talk to a doctor or registered dietitian when you have a particular condition or a persistent worry.
None of this means you should abandon healthy foundations such as regular sleep, a varied diet, daily movement and strong relationships. But the next time someone tuts at your morning coffee, midday nap or cracking fingers, you can reply with confidence that the science is a lot more forgiving than the folklore.
