With the extra busy schedules people have these days, fitness tracking apps have helped many people time and track their exercise time, calories burnt and the time taken to do so. These apps also remind us to drink water, not exceed our calorie limits for the day, as well as keep exercising. However, sometimes these devices can have an adverse impact on our health. Instead of making us feel better, they can make us feel anxious or stressed. This generally happens when we become too focused on the numbers and start to worry if they aren't perfect. It's important to understand that while these trackers can be helpful, they shouldn't control our mood or make us feel bad about ourselves.

A recent study published in the Journal of the American Heart Association also found that people with heart problems who used trackers were more worried about their symptoms. With so many people using these devices, it's becoming a common problem. 20% of wearable users felt anxious and always contacted their doctors when they received an irregular rhythm notification. They also found that these devices meant increased monitoring and worrying, higher usage of AFib (atrial fibrillation) specific health care etc. These findings suggest that while wearables can help patients monitor their AFib, they may also lead to increased anxiety and health care use. More research is needed to fully understand the effects of these devices on patients, doctors, and the health care system.

Signs These Apps May Be Getting Too Much For You

We can become too focused on achieving certain goals, like a certain number of steps or a perfect sleep score. This can lead to stress and anxiety when we don't meet those goals, instead of simply using the information to support a healthy lifestyle.

Your Metrics Influence Your Mood

If your happiness or sadness depends on the numbers your fitness tracker shows, it's a sign you might need a break. Getting a low score can make you feel like you've failed, even if you've been making healthy choices. It's normal to feel a little disappointed when you don't reach a goal, but your overall mood shouldn't be affected. If you notice that your mood changes a lot based on your tracker's data, it might be time to step away from it for a while.

You Constantly Try To Interpret Your Numbers

If you find yourself constantly searching online to understand what your tracker's data means, it's a warning sign. Trying to interpret every number can lead to more worry and confusion. You might start to believe you have health problems that don't exist. It's important to remember that these trackers are tools, not medical professionals. Spending too much time trying to decode the data can increase your anxiety instead of helping you.

You Feel Anxious When You Can’t See Your Data

If you feel nervous or anxious when you forget your tracker or it's not working, you might be too dependent on it. You should be able to feel comfortable and relaxed without constant data. If you feel panicky when you can't see your numbers, it's a sign you need to learn to be okay without them. You should be able to trust your body's signals instead of relying only on the tracker.

You’re Ignoring How Your Body Feels

If you rely only on your tracker and ignore what your body is telling you, it's a problem. Your body's signals are important. For example, you might feel well-rested, but if your tracker says your sleep quality is low, you might start to doubt yourself. It's important to listen to your body and not just the numbers. Your body knows when it's tired, hungry, or needs rest. The tracker is a tool to support your health, not replace your body’s signals.

Worried about your graying hair? It may reflect a natural cellular response to DNA damage, according to a study by Japanese researchers.

Hair color comes from melanocyte stem cells (McSCs), which live inside hair follicles and produce melanin, the pigment responsible for hair and skin color. These cells are especially sensitive to DNA damage from environmental and internal factors.

While DNA damage is linked to both aging and cancer, researchers at the University of Tokyo found that McSCs can take different paths after being damaged — including one that leads to hair graying and another associated with melanoma, a type of skin cancer.

How Does Gray Hair Act As A Defense?

When McSCs suffer certain types of DNA damage, they can undergo a process called senescence-coupled differentiation, or seno-differentiation. The damaged stem cells permanently differentiate and are eventually lost, leading to hair graying.

This response is driven by the p53–p21 pathway and may help eliminate damaged cells before they can become cancerous.

Also read: Unusually High Cancer-Fighting Immune Cells Could Explain Why Some People Live Beyond 100: Study

What Did The Study Find?

Published in Nature Cell Biology, the study examined how McSCs respond to different types of DNA damage.

Professor Emi Nishimura and Assistant Professor Yasuaki Mohri used long-term in vivo lineage tracing and gene-expression profiling in mice to study the fate of these stem cells.

The researchers found that DNA double-strand breaks triggered seno-differentiation. In this process, damaged McSCs irreversibly differentiate and are lost, resulting in hair graying.

However, the response was different when the cells were exposed to certain carcinogens, including 7,12-dimethylbenz(a)anthracene, or ultraviolet B. In these situations, McSCs could bypass the protective differentiation process, retain their ability to self-renew and expand clonally.

This process was supported by KIT ligand signals from the surrounding tissue and epidermis, which suppressed seno-differentiation and pushed the cells toward a tumor-prone state.

“These findings reveal that the same stem cell population can follow antagonistic fates—exhaustion or expansion—depending on the type of stress and microenvironmental signals,” Nishimura said.

“It reframes hair graying and melanoma not as unrelated events, but as divergent outcomes of stem cell stress responses,” she added.

Does Gray Hair Prevent Cancer?

Read More: Ferritin Face: Can Pale Skin Signal Iron Deficiency?

Not necessarily. The study does not show that people with gray hair have a lower risk of cancer.

Instead, the findings suggest that hair graying can be the result of a protective cellular response in which damaged stem cells are eliminated. When that response is bypassed, damaged McSCs may persist and contribute to melanoma development.

The researchers say the findings offer a framework for understanding how the same stem-cell population can contribute to either tissue aging or cancer depending on the type of damage and signals from the surrounding environment.

Can You Prevent Premature Graying?

Genetics plays a major role in when hair turns gray. There are also some lifestyle changes that can prevent graying, support hair and overall health. These include:

• Managing stress
• Eating a nutrient-rich diet
• Protecting your hair and scalp from excessive UV exposure
• Avoiding excessive heat and harsh chemical treatments
• Avoiding smoking.

An Alzheimer’s patient may vividly remember their wedding day from 40 years ago, remember the house they grew up in or sing a song they learned in childhood, but still struggle to remember what they ate for breakfast or a question they were asked just an hour ago.

So if Alzheimer’s is a memory loss disease, why do some old memories appear to remain intact while recent ones disappear so quickly?

According to leading experts, the answer lies in the way different memories are formed, stored and retrieved in the brain. It is also in the fact that Alzheimer’s does not damage every memory system at the same speed. This means that the ability to form and retain new memories can become impaired before older memories are affected.

“In Alzheimer’s, memory loss does not always happen evenly. The brain regions responsible for forming and storing new memories, particularly the hippocampus and surrounding areas, are often affected early,” Dr K K Jindal, Director, Neurology, CK Birla Hospital, Delhi, told HealthandMe.

Recent Memories Disappear First

A person with Alzheimer's disease may remember a marriage, childhood home or an event from 40 years ago, but not remember a meal or conversation from an hour earlier. To understand this, it helps to look at what happens when a new memory is formed.

Dr Praveen Gupta, Chairman, Marengo Asia International Institute for Neuro and Spine, Marengo Asia Hospitals, Gurugram, told HealthandMe, “The memories that Alzheimer’s erodes do not deteriorate at equal rates. One of the first brain functions to be compromised is the creation of new memories. This is because the older memories have enough time to spread their representations in the brain while the newer memories rely on memory circuitry that is very vulnerable.”

Dr Saurav Aggarwal, Consultant, Neurology, Fortis Hospital, Ludhiana, explained the process to HealthandMe through the concept of memory consolidation. He said when a person experiences something new, the memory initially depends heavily on the hippocampal network.

Dr Aggarwal said, “Old memories go through consolidation, where the brain spreads a memory across the cortex, its outer layer, including the temporal and frontal lobes. Years of retelling strengthen those links.”

By contrast, new memories remain heavily dependent on the hippocampal network. “Alzheimer's damages the hippocampus first, so the brain fails to consolidate new information, such as a memory from the morning or a few hours ago, causing it to fade” Dr Aggarwal says.

Older memories have therefore had years, sometimes decades, to become more represented and strengthened through repetition and recall. New memories do not have that advantage.

Also read: Donald Trump Wants Childhood Vaccines Split Into 5 Shots To Prevent Autism: But Is There Evidence?

The Hippocampus Is More Than The Brain's Memory Bank

The hippocampus is not just a storage box for memories. It plays a crucial role in organising and absorbing new experiences. Dr Aggarwal describes it as a “sorting desk”.

He says, “The hippocampus works like a sorting desk. It takes in new experiences, a step called encoding, and passes them to the cortex for storage, meaning that proper memories cannot be formed if the hippocampus is damaged.”

The hippocampus is particularly vulnerable in Alzheimer’s disease. According to Dr Aggarwal, two abnormal proteins are central to the disease process.

“Two abnormal proteins drive this damage. Amyloid forms plaques between neurons, and tau twists into tangles inside them,” Dr Aggarwal says. “Tangles appear first in the entorhinal cortex, the hippocampus's gateway. They spread inward and, with amyloid plaques, damage the connections between neurons (synapses).”

Dr Steve Paul Manjaly, Geriatric Medicine, Apollo Hospitals, Bangalore, told HealthandMe that the hippocampus has a high level of synaptic transmission, which makes it particularly vulnerable to toxic processes linked with Alzheimer’s disease.

He explains, “The hippocampus is the seat of memory and has high synaptic transmissions, making it prone to toxicity,” he says. “Also the pathology is such that the affect the networking pathways that affect the hippocampus majorly.”

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All Memories Are Different

One important misconception about Alzheimer’s is that there is one single type of memory that simply gets weaker over time. In reality, the brain uses several memory systems, and they can be affected at different stages.

“There is no single memory system; the three different types of memory systems are episodic memory, semantic memory, and procedural memory,” says Dr Gupta.

Episodic memory refers to personal experiences. For example, what happened yesterday, where a person went, or what they discussed during a particular conversation. This is affected earlier.

Semantic memory involves facts, information, words and their meanings. “Semantic memory is about names. E.g Delhi is the capital of India. This is affected much later in Alz,” Dr Manjaly explains.

Procedural memory is the memory of how to perform learned skills. “Procedural memory is about how something was learned. E. G driving a cycle etc. This is affected later in the disease,” he says. This is why someone with Alzheimer’s may forget what they had for lunch but still be able to tie their shoelaces or perform a familiar skill.

Also read: Scientists Grow Human Brain Tissue Inside Mice: Could This Help Cerebral Palsy, Epilepsy & Autism Research?

Why Can A Patient Sing An Old Song But Forget A Person's Name?

One of the most striking and fascinating examples of preserved memory in Alzheimer’s is music. Families of people with dementia often notice that a loved one who struggles to remember names or recent conversations may still be able to sing an old song almost perfectly.

Songs are encoded through more than their words. Rhythm, melody, repetition, emotion and long-established associations all contribute to how they are represented in the brain.

“The various types of memories involve different neural networks,” says Dr Gupta. “Songs we know are not just about words; songs have associations with rhythm, emotions, repetition, and neural links that have been created since ages.”

Dr Aggarwal notes that procedural skills involve structures such as the basal ganglia and cerebellum, which tend to be affected later in Alzheimer’s disease.

Musical processing also involves several networks beyond the hippocampus, some of which may remain relatively preserved. This helps explain why familiar routines, songs and well-practised skills can sometimes survive long after the ability to form new memories has deteriorated.

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When Is Forgetfulness More Than Normal Ageing?

Forgetting sometimes is not, by itself, evidence of Alzheimer’s disease. With normal ageing, people may take longer to retrieve a name, need more time to learn something new or occasionally forget something, and remember it later. The more important warning signs are progression, frequency and impact on everyday functioning.

Dr. Gupta explains, “What matters most is not that they are forgetting but the frequency with which it occurs, that it is becoming progressively more problematic, and that it starts to interfere with daily functioning.”

According to the experts, warning signs may include:

• Repeatedly asking the same question within a short period
• Forgetting conversations or events that happened recently
• Getting disoriented in familiar places
• Misplacing objects and not being able to retrace one's steps
• Struggling with familiar recipes
• Having difficulty managing finances or medications
• Developing problems with words or understanding conversations
• Showing poorer judgement or decision-making
• Becoming increasingly dependent on family members for tasks previously handled independently

How Do Doctors Determine Whether Memory Loss Is Due To Alzheimer’s?

According to the doctors, Alzheimer’s diagnosis begins with a detailed history, including when the symptoms started, how they have progressed and how they affect daily functioning.

Information from family members can be particularly important because a person experiencing memory impairment may not recognise the extent of the changes.

“Now, the diagnosis of Alzheimer's is not just about memory tests,” says Dr Gupta. “We utilize a comprehensive assessment along with high-tech investigation methods like serum markers and PET scanning to find out the presence of biological markers of Alzheimer's disease.”

Besides memory loss, several medical conditions can produce symptoms that resemble dementia. Vitamin B12 deficiency and thyroid disorders can contribute to cognitive problems and need to be considered.

Experts say that blood tests can help identify such reversible contributors, while an MRI can look for strokes and patterns of brain shrinkage.

“MRI scans and pet scans can help narrow it down further and help sometimes in ruling out other causes of cognitive impairment,” Dr Manjaly says. “Thyroid and vitamin b12 deficiencies are also conditions that may mimic dementia.”

Modern diagnosis can also go beyond symptoms and structural imaging. Dr Aggarwal says amyloid PET imaging and cerebrospinal fluid testing can provide additional evidence of Alzheimer’s pathology by detecting abnormal protein changes associated with the disease. The exact combination of tests depends on the individual patient and overall clinical situation.

Unlike most serious medical conditions, where outcomes depend almost entirely on what happens inside a hospital, cardiac arrest is different in one important respect: the person with the greatest power to change what happens next is almost never a doctor. It is whoever is standing closest. The heart can be restarted. Brain damage can be prevented.

India records more than 700,000 cardiac arrest deaths each year. Across South Asia alone, an estimated 5.5 million cardiac arrests occur annually. What separates a death from a recovery is not the sophistication of the care that eventually arrives. It is what any individual knows to do in the minutes before it does.

Not a Heart Attack. Something Faster

Sudden cardiac arrest is frequently confused with a heart attack, but the two are different events. A heart attack occurs when a blocked artery cuts off blood supply to the heart muscle. Cardiac arrest is categorically different: the heart stops beating entirely, and with it, all circulation to the brain and body ceases. A person can have a heart attack and still have a pulse.

In cardiac arrest, there is none. Every minute without CPR or defibrillation reduces the chance of survival by roughly 10 to 12 percent. In India's major cities, an ambulance takes between 15 and 20 minutes to arrive; in rural areas, over 60 minutes. These numbers place the first line of response where it has always been: with whoever is already in the room.

Also read: Women’s Heart Health May Start Changing In Late 30s, Way Before Menopause

India's Distinct Risk Profile

The epidemiological picture in India has a distinctly local character. Data from South India show that the average cardiac arrest victim is 48 years old, predominantly male, and often without any prior diagnosis of heart disease. Lifestyle factors including physical inactivity, smoking, and alcohol consumption are consistent contributors, particularly among younger patients.

Perhaps most significant, 41 percent of autopsied patients with confirmed cardiac muscle damage showed no severe arterial blockage. Standard cardiovascular risk screening, designed primarily to detect blocked arteries, may therefore be missing a meaningful portion of those most at risk in India's population.

Also read: Why Are Heart Risks Rising Among Hispanic Adults? New AHA Report Points To Diabetes, Obesity & BP

The Most Solvable Gap

The most immediate opportunity lies not inside the hospital but in the space between a collapse and an ambulance. Only 1.3 to 9.8 percent of bystanders in India attempt CPR during a cardiac emergency, and fewer than 15 percent of urban Indians have received any formal training. These figures are the primary reason India's survival rate for out-of-hospital cardiac arrest sits below 2 to 3 percent.

CPR requires no equipment and no medical degree. Steady chest compressions from anyone nearby can sustain blood flow to the brain until professional help arrives. Schools, workplaces, residential societies, and places of worship each represent a real and scalable training opportunity.

Where public health frameworks establish the groundwork, private sector partners have the infrastructure to extend that reach across the country. This is precisely the kind of challenge that structured public-private collaboration is designed to meet.

The Opportunity Ahead

Cardiac arrest incidence in India is projected to rise by 30 percent over the next decade as diabetes and hypertension rates continue to climb. That is a known trajectory, which means it is also a manageable one. AI tools now predict cardiac arrest up to 24 hours in advance using routine ECG data, and these technologies are already being developed with India's specific healthcare constraints in mind. What those tools ultimately do, however, is buy time.

The biological window of the first few minutes will always depend on whoever first responds to the patient. The country's greatest lever is not a device or a drug. It is an informed bystander who takes immediate action.