Blue light emitted by devices like smartphones, computers, and televisions is becoming a major factor disrupting our sleep cycles. Research reveals that a significant number of Americans use electronic devices close to bedtime, contributing to poor sleep quality. Reducing exposure to blue light, particularly in the evening, is a simple yet effective way to help your body prepare for restful sleep.

What Is Blue Light?

How Does Blue Light Impact Circadian Rhythms?

Circadian rhythms are 24-hour cycles that control essential bodily functions, including sleep. Light is the primary factor that aligns these rhythms with day and night. Historically, exposure to sunlight during the day helped set our body clocks, signaling when to be awake and when to sleep. However, the widespread use of artificial lighting and electronic devices has introduced more light exposure after dark, disrupting these natural cycles.

Blue light, in particular, has the strongest impact on circadian rhythms. During daylight hours, blue light helps us feel alert by stimulating the brain, raising body temperature, and increasing heart rate. But in the evening, exposure to blue light can confuse the body’s internal clock, suppressing melatonin—the hormone responsible for making us feel sleepy. As a result, our brains may remain in “daytime mode,” preventing us from winding down for the night.

Health Consequences Of Disrupted Sleep

Persistent disruption of circadian rhythms can lead to a range of health issues, including metabolic disorders, poor mental health, and increased risk for conditions like depression and anxiety. Furthermore, the inability to sleep well at night affects cognitive performance, mood, and overall well-being. Chronic exposure to blue light in the evening may significantly contribute to these negative health outcomes.

Devices That Emit Blue Light

Many common devices in our daily lives emit blue light, including:

- Smartphones and tablets

- Computer monitors and laptops

- Televisions and e-readers

- LED and fluorescent lighting

- Video game consoles

How To Minimize Blue Light Exposure

To reduce the effects of blue light on your sleep, here are some practical strategies:

1. Turn off screens before bed: Try to avoid using electronic devices at least two to three hours before bedtime. Reducing screen time helps prevent blue light from interfering with melatonin production.

2. Adjust your lighting: Dim your home’s lights or switch to warmer-toned lighting in the evening. You can also use lamps with red or orange light, which are less likely to impact your circadian rhythms.

3. Night mode settings: Many smartphones and computers have a "night mode" feature that reduces blue light emission. Make use of these features to limit exposure in the hours leading up to bedtime.

4. Blue light-blocking glasses: Special glasses designed to filter out blue light may be helpful for some individuals. These glasses can block or reduce the melatonin-suppressing effects of blue light.

5. Apps for blue light reduction: There are several smartphone and computer apps available that reduce blue light emission, allowing you to use your devices before bed without disturbing your sleep.

6. Create a sleep-friendly environment: If you can’t control light sources in your bedroom, consider using an eye mask to block out ambient light and promote better sleep.

Blood tests are often a source of dread for people in our society. While many people dread the needle stick, most are scared of what the results may show. Even before consulting a physician, most people nowadays would consult an AI-powered platform to verify and interpret the values of their blood tests. However, such online searches most often give rise to more uncertainties and confusion rather than answering the basic queries. Thus, this article is an attempt to shed some light on the basics of common blood test results.

LIPID PROFILE

Lipid profile is one test that everyone should do, at least occasionally, after the age of 40. This is a silent epidemic, and without blood tests, no clinical symptoms can reliably identify raised lipid parameters. There are multiple parameters printed in the report, but the main values we are looking for are total Cholesterol, triglycerides, LDL, and HDL. There are many others, but the interpretation of those is best left to your physician. Total Cholesterol should be less than 200, triglycerides less than 150, and the “bad” cholesterol, or LDL, should be below 100. On the other hand, HDL, the “good” cholesterol, should be above 40 for men and above 50 for women. So, for HDL, we want the values to be higher! However, whether deranged lipid parameters warrant treatment and, if so, for how long, will be the clinical decision of your doctor.

CBC

CBC means complete blood count. This is the most basic test done for every patient. In this test, we check for levels of haemoglobin, total leukocyte count, differential white cell count, platelet count, and ESR. Besides, there are numerous other parameters printed in your report, like MCV, MCH, MCHC, RDW, and PDW. But let’s first look at the basic parameters. Haemoglobin is perhaps the most important parameter to look at. It shows how much oxygen your blood can carry. Low hemoglobin is called anemia. If you have anaemia, you need to get treatment ASAP. The standard normal values of hemoglobin depend on age and gender and also physical states like pregnancy. The normal hemoglobin of an adult male will be different from that of an adolescent girl. There are many different causes of anaemia in our society, like iron deficiency, worm infestation, thalassemia, and kidney disease. Your doctor will do further tests to elucidate the cause.

The next most important parameter is total leukocyte count. This gives an indication of whether you have any infection or inflammation. Conversely, in some conditions like Typhoid, the counts may be low despite fulminant infection. Platelet count is also important in infections like dengue, where it may get dangerously low. We need to check platelet count repeatedly, sometimes even twice or thrice the same day, in dengue infection. Platelet count may be low in some forms of blood cancer too.

The other parameters like MCV and RDW are too complex to be discussed in this short article. Suffice it to say, they are deranged in conditions like Thalassemia, sickle cell disease, vitamin B12 deficiency, and hereditary Red cell membrane disorders.

Also Read: BTS’ V Opens Up About 2-Year Battle With Hearing Loss

And finally, the ESR is a very non-specific parameter. It can be raised in multiple conditions, ranging from cancer to inflammation. It is usually interpreted in unison with other necessary tests.

Dr Rudrajit Paul, Consultant Physician, Manipal Hospital, Kolkata

“All That” star Christy Knowings has died after reportedly suffering an asthma attack that led to cardiac arrest and brain damage.

The 46-year-old actress was hospitalized on August 7 after the attack and placed on life support, TMZ reported.

According to TMZ, citing family sources, Knowings suffered cardiac arrest following the asthma attack. Her family decided to take her off life support on August 11.

Knowings, who was born on February 25, 1980, in the Bronx, is the second former All That cast member to die this year, following the fatal hit-and-run death of Kianna Underwood in January in Brooklyn.

In a Facebook post, Knowings’ aunt wrote that her niece was an “outstanding actress, comedian, twin sister” and an “amazing daughter.”

Knowings’ reported death after complications from an asthma attack is a reminder that while asthma can often be managed, it should not be taken lightly, health experts told HealthandMe.

What Is Asthma? How Severe Can It Turn?

Dr. Abhijit Ahuja, Consultant Pulmonologist, Saifee Hospital, Mumbai, explained that asthma is a condition that makes it difficult to breathe because the airways become inflamed and narrow.

Many people with asthma can control their symptoms with medication. However, an asthma attack can sometimes become severe and life-threatening.

During an asthma attack, symptoms suddenly worsen and usual medication may not provide enough relief. A person may experience difficulty breathing, wheezing, chest tightness, severe coughing or trouble speaking.

“If you use your inhaler but still have trouble breathing, you need to go to the hospital right away,” Dr Ahuja said.

When the airways become so narrowed that the body does not receive enough oxygen, the asthma attack can turn severe. The lungs may also be unable to remove carbon dioxide properly.

“If this keeps happening, it can hurt parts of the body like the brain and the heart,” Dr Ahuja said.

A severe asthma attack can lead to difficulty breathing, loss of consciousness, brain injury and cardiac arrest.

When Can an Asthma Attack Be Deadly?

Dr. Taniya Mehta, Consultant Respiratory Medicine, Sterling Hospitals, Gujarat, told HealthandMe that while most asthma attacks can be treated, a very severe attack can become deadly when the airways become so tight that the lungs cannot get enough oxygen.

“If treatment isn't given quickly, low oxygen levels can cause the lungs to stop working, damage the brain, cause the heart to stop and lead to death,” she said.

Signs That an Asthma Attack Is an Emergency

Seek emergency medical help if a person has:

• Breathing difficulty or wheezing that is rapidly getting worse.
• Trouble speaking more than a few words because of breathing difficulty.
• No improvement after using a quick-relief inhaler.
• Blue, grey or very pale lips, fingernails or skin, which may indicate low oxygen.
• Severe confusion or loss of consciousness.

Who Is More Likely to Have a Severe Asthma Attack?

People may be at greater risk if they:

• Have had a severe or life-threatening asthma attack before.
• Need to use their quick-relief inhaler frequently.
• Do not use their asthma medicines as prescribed.
• Do not have their asthma under control.
• Cannot recognise when their symptoms are getting worse.

Do Not Wait Out a Severe Asthma Attack

Deadly asthma attacks are uncommon, but they can happen quickly, the doctors warned.

Taking asthma medication as prescribed, knowing how to use inhalers correctly, attending follow-up appointments and undergoing lung tests when needed can help keep asthma under control.

Walking past a bakery and suddenly craving a pastry, even though you’re not physically hungry.

Seeing an ad for your favorite pizza while watching TV and suddenly thinking about ordering it, even though you’ve just had dinner.

Do you experience this too? This is often referred to as “food noise”—persistent cravings, thoughts or mental chatter about food that can occur even when you’re not physically hungry.

A 2025 study published in Nutrients found that 57% of people with obesity reported experiencing food noise.

Constant exposure to food cues—from social media posts and advertisements to food-delivery apps and supermarket aisles—can further fuel these cravings.

While thinking about food is a natural part of everyday life, for some people living with obesity, these thoughts can become persistent and difficult to escape. This may contribute to overeating and, over time, make weight and metabolic health harder to manage.

HealthandMe spoke to Dr. Jasjeet S Wasir, Bariatric & Metabolic Physician, Director, Medanta – The Medicity, to understand the mechanism behind food noise.

What Is Food Noise?

“Food noise is like having a notification pinging on your phone every few minutes. You can ignore it a few times, but eventually the constant pinging wears down your attention and willpower, and you give in to it and indulge,” Dr. Jasjeet said.

A more formal, non-medical definition of food noise is persistent, intrusive thoughts about food, such as cravings, mental “chatter” about what to eat next, or a preoccupation with eating that some people experience throughout the day, seemingly independent of actual hunger.

Normal Hunger vs Food Noise

Normal hunger, or the “hunger of the body”, occurs when the body needs food and the brain responds to that need. Once adequate nutrition and calories have been consumed, appetite is influenced by satiety signals and hormones such as leptin, GLP-1 and insulin.

With food noise, however, thoughts about eating can persist even when a person is not physically hungry.

The biology behind food noise is not necessarily a primary defect in the physiological hunger system, but may involve overactivation of the reward system. This system influences mood, motivation, pleasure and cravings and can be activated by food-related cues such as sight, smell and memory, Dr. Jasjeet said.

What Can Trigger Food Noise?

Common situations in which people may experience heightened food noise include:

• Chronic calorie restriction or dieting
• Chronic sleep deprivation
• Chronic stress
• Rare genetic disorders of the reward system

Could Food Noise Affect Prediabetes and Weight?

Dr. Jasjeet said that "there is no direct or linear correlation between prediabetes and food noise. The relationship is more complex, and it can be difficult to determine which comes first".

In a healthy state, insulin acts on appetite centers in the brain and helps suppress hunger. Prediabetes, in most cases, involves insulin resistance. Insulin resistance in the brain may alter this appetite-suppression effect and potentially contribute to persistent food-related thoughts.

At the same time, prediabetes, excess weight and increased cravings can share common underlying factors, including insulin resistance, inadequate sleep, stress, dietary patterns, genetics and the food environment.

"Food noise becomes important when thoughts about food begin to influence everyday eating behavior—for example, when a person repeatedly eats without physical hunger or finds it difficult to stop thinking about food," the expert said.

If persistent food-related thoughts contribute to excess energy intake and weight gain, they may adversely affect metabolic health and perpetuate insulin resistance. Over time, this can increase the risk of complications such as type 2 diabetes.

However, the doctor said that food noise is not a symptom or diagnostic marker of prediabetes. Prediabetes needs to be identified through appropriate blood glucose tests.

Insulin Resistance Alone Does Not Cause Food Noise

Dr. Manjunath Malige, Director, Endocrinologist, Diabetologist, Obesity & Weight Management Specialist, Sakra World Hospital, Bengaluru, told HealthandMe that people with prediabetes usually have some degree of insulin resistance, but insulin resistance alone cannot be said to cause food noise.

Appetite and eating behavior are complex and influenced by biological signals, brain reward pathways, environmental food cues, sleep, stress and learned behaviors.

In India, where diets can sometimes be carbohydrate-heavy and low in protein or fiber, some people may experience greater fluctuations in hunger and cravings. When this constant chatter around food becomes excessive, it can take up significant mental space. If it leads to frequent snacking or overeating, it can make weight and blood glucose management more challenging.

How Can Food Noise Be Managed?

Dr. Jasjeet said the first step is not to fight food or impose extreme restrictions, but to understand what is driving the urge to eat.

The doctor noted that ask yourself: Is it genuine hunger, or are you eating because of stress, boredom, habit or simply because food is available?

Having structured, balanced meals with adequate protein, vegetables, fiber and healthy fats can improve satiety. Excessive restriction or skipping meals can sometimes make cravings worse.

Other important factors include:

• Good-quality sleep
• Regular physical activity
• Stress management

Most importantly, the experts noted that the goal is not to never think about food, as food is an important part of our lives and culture. The concern is when these thoughts become intrusive, distressing or start controlling eating behavior. In such cases, it is important to seek professional guidance.