Dr Sudhir Kumar MD DM Profile picture
Neurologist, Apollo Hospitals, Hyderabad/ Running, Fitness, Health/ On a mission to prevent people from becoming patients/ Online consultation: Apollo 24/7 app
Jul 15 6 tweets 2 min read
QUIZ
Which exercise is most effective for losing belly fat and deep visceral fat?

A) Abdominal crunches/sit-ups

B) Zone 2 training (brisk walk/slow jog)

C) HIIT (High-Intensity Interval Training)

D) Strength training/lifting weights

(Vote below before reading the answer!)
1/nImage THE TRUTH:
❌If you chose A, you are trapped in one of the biggest fitness myths.

✅Abdominal crunches will strengthen and tone your core muscles, which is excellent for spinal stability, but they will not burn off the fat sitting on top of them. Spot reduction is a physiological myth.

To lose belly fat, and more importantly, dangerous visceral fat (the deep metabolic fat wrapping around your internal organs), you need an evidence-based, multi-system approach.
2/n
Jul 8 12 tweets 2 min read
How much exercise is enough for good health?

🔸Most people know: "Exercise is good."
🔸However, very few know: How much exercise gives the maximum health benefit?
🔸Can you exercise too little?
🔸Can you exercise too much?

In this post, I would discuss the amount of exercise needed to maximize the health-related benefits and the science behind this. Bookmark for future reference.
1/n
The biggest health gain comes from doing SOMETHING instead of NOTHING.
✅A sedentary person who starts walking 10–15 minutes daily experiences a dramatic reduction in risk.
✅The first few minutes of activity provide the largest health return.
▶️Going from 0 to 30 minutes is far more beneficial than going from 90 to 120 minutes.

This is why some is always better than none.
2/n
Jul 6 9 tweets 2 min read
The biggest mistake I see in the gym?
People spend 45–60 minutes running...
THEN head to the weights.

If your goal is to become stronger, build muscle, improve bone health, or stay functionally fit as you age, you are probably doing it in the wrong order.

Please carefully go through this thread to understand what I mean and the scientific reasons for the same.
1/n
What is the ideal approach?
✅ Strength training and cardio on alternate days (≈24-hour gap).

✅This minimizes the "interference effect," allowing your muscles and cardiovascular system to adapt optimally to each type of exercise.
2/n
Jul 4 9 tweets 2 min read
A 40-year-old man came with this question:
"My cholesterol is only mildly high, but my hs-CRP is 8.
Does that mean I have dangerous inflammation somewhere?"

Here is what everyone should know about hs-CRP.
1/n
What is hs-CRP?
✅hs-CRP (high-sensitivity C-reactive protein) is a blood test that measures low-grade inflammation in the body.
🔸It is not a diagnosis or disease.
🔸Think of it as a smoke alarm, not the fire itself.
2/n
Jun 29 15 tweets 3 min read
"I Lost 7.5 kg by Giving Up Rice, Chapati & Dosa." Did Those Foods Really Cause the Weight Loss?

Congratulations on the weight loss!

But here's the important question: Was it because she stopped eating rice... or because she started eating fewer calories overall?

Read this thread to understand the science.
1/n The biggest myth about weight loss:
❌ There is no single food that causes obesity.

✅People gain weight when they consistently consume more calories than they burn.
2/n
Jun 27 15 tweets 3 min read
The Best Foods for Your Brain? Science Has an Answer (Hint: It's NOT Blueberries or Turmeric Alone)

Every week, a new "superfood" promises a sharper memory or protection against dementia.
But what does the evidence actually say? Let us separate facts from marketing.

1/n
Here is the biggest myth:
❌ There is no single food that can dramatically boost your memory or prevent dementia.

Your brain needs a healthy dietary pattern, rather than a single miracle food. 2/n
The diet with the strongest evidence for brain health?
✅The Mediterranean diet.

Dozens of studies have linked it with:
✅ Lower risk of stroke
✅ Better cognitive function
✅ Slower cognitive decline
✅ Lower risk of dementia
It is consistently ranked among the healthiest diets in the world.
Jun 27 14 tweets 3 min read
What Happens to Your Brain If You Sleep Only 5 Hours a Night?

Many people proudly say: "I sleep just 5 hours and function perfectly." However, scientific evidence does not support this.

Read this post to learn about the adverse effects of sleep deprivation and tips to get good sleep. Bookmark this for future reference and share for wider reach.

1/n
Sleep is not "downtime."
While you sleep, your brain is incredibly busy:
🧠 Consolidating memories
🧠 Removing metabolic waste
🧠 Repairing nerve cells
🧠 Regulating emotions
🧠 Resetting hormones 2/n
One night of only 5 hours' sleep can affect your brain the next day.
Studies show:
❌ Reduced attention
❌ Slower reaction time
❌ Poorer decision-making
❌ More mistakes
❌ Reduced productivity
You may feel okay, but your performance is negatively affected.
Jun 26 11 tweets 3 min read
One of the saddest patients I see is a young person with a massive brain hemorrhage after a night of heavy drinking.
Most people don't realize alcohol can rupture a blood vessel in the brain.

Alcohol and Brain Hemorrhage: What Everyone Should Know
Most people know that alcohol can damage the liver. Far fewer know it can also trigger a brain hemorrhage, a type of stroke that carries a high risk of death and disability.

Here is a thread with details of current evidence. Bookmark this for future reading and share for wider public awareness.
1/n
A brain hemorrhage (intracerebral hemorrhage) occurs when a blood vessel inside the brain ruptures and bleeds. It accounts for only 10–15% of all strokes, but causes nearly half of stroke-related deaths.
2/n
Jun 25 20 tweets 3 min read
COFFEE: Is it a friend or Foe?
Coffee is one of the most consumed beverages in the world. Yet myths about it refuse to die.
Let us separate facts from fiction. Bookmark this thread for future reference, and share for wider reach. Post your comments below.

1/n
Coffee is NOT just a wake-up drink.
Coffee contains hundreds of biologically active compounds, including polyphenols and antioxidants. In fact, for many people, coffee is one of the largest sources of antioxidants in the diet. 2/n
Is coffee healthy?
The answer is surprisingly: YES.
Large studies consistently show that regular coffee consumption is associated with lower risks of:
✅ Type 2 diabetes
✅ Liver disease
✅ Fatty liver
✅ Liver cancer
✅ Parkinson's disease
✅ Cardiovascular disease
✅ Premature death
Association does not prove causation, but the evidence is remarkably consistent.
Jun 23 12 tweets 2 min read
MELATONIN FOR SLEEP: What Most People Get Wrong
Melatonin gummies and tablets have become hugely popular. Many people take them every night hoping for "better sleep."
But what exactly is melatonin, and who benefits from it?
A thread examining the evidence for and against melatonin.

1/12
What is melatonin?
🔸Melatonin is a hormone naturally produced by the brain (pineal gland), mainly after sunset. Its primary role is to regulate the body's internal clock (circadian rhythm). Think of it as a "darkness signal" rather than a sleeping pill. 2/12
Melatonin doesn't work like traditional sleeping pills
🔸A common misconception is that melatonin will "knock you out." It usually doesn't. Instead, it tells your body that it is time to prepare for sleep.
Jun 23 12 tweets 3 min read
Evidence-Based Facts about SLEEP Everyone Should Know
Misconceptions about sleep are common. In this thread, I discuss evidence-based facts about sleep. Bookmark for future reference and repost for wider reach.

1/12
How much sleep do adults need?
✅Most adults need 7–9 hours of sleep per night.
🔸Some function well with slightly less or more, but regularly sleeping <6 hours or >9–10 hours is associated with adverse health outcomes. 2/12
Sleep duration is important, but so is sleep consistency
✅Going to bed and waking up at roughly the same time every day helps regulate your circadian rhythm.
🔸Irregular sleep schedules are associated with poorer metabolic health, mood disturbances, and daytime sleepiness.
Jun 22 20 tweets 3 min read
Common Myths & Misconceptions About Type 2 Diabetes: A Thread
Repost/share for wider reach and bookmark for future reference. Post your comments and queries below.
1/n
Type 2 diabetes is one of the most misunderstood health conditions. Many patients receive advice from friends, relatives, social media influencers, and even well-meaning neighbors.
Let's separate myths from facts. 2/n
MYTH: "Eating sugar causes diabetes."
FACT: Type 2 diabetes is caused by a combination of insulin resistance, genetics, excess body fat, physical inactivity, poor sleep, and other factors.
🔸Sugar alone does not "cause" diabetes, although excess calories and weight gain increase risk.
Jun 20 11 tweets 2 min read
How I lowered my resting heart rate from the 70s to the 40s (and why it matters)
Read this important thread, repost it for wider reach and bookmark for future reference. Post your comments and queries below.

1/n
🔸My resting heart rate (RHR) used to be in the 70s. Today, it is consistently in the low-to-mid 40s.
🔸I did not take any special supplements, and there are no hacks either. The ‘secret” is just 5.5 years of consistent lifestyle changes. 2/n
The biggest factor was running.
🔸For the first 2 years, I averaged 10–15 km/day. Over the last few years, I have averaged 6-8 km/day.
🔸Regular aerobic exercise trains the heart to pump more blood with each beat, so it doesn't need to beat as often at rest.
Jun 14 15 tweets 3 min read
"My cholesterol is normal. How did I get a heart attack?"
This is one of the commonest questions I hear from patients.
The answer may explain why Indians develop heart disease 5-10 years earlier than many Western populations.
A thread. Repost for wider reach and bookmark for future reference.
1/n
🔸Many people believe: Normal cholesterol = No risk of heart attack.
🔸Unfortunately, this is not always true.
🔸A significant proportion of heart attacks occur in people whose routine lipid profile appears "normal."
2/n
Jun 12 13 tweets 2 min read
Lipid Profile vs ApoB & ApoA1: Which Better Predicts Future Heart Disease Risk?
Most people are familiar with cholesterol testing. But increasingly, we are paying attention to two proteins:
🔸Apolipoprotein B (ApoB)
🔸Apolipoprotein A1 (ApoA1)
What are they and should you get them tested?
A thread.
1/n
Traditionally, cardiovascular risk assessment relies on:
🔸LDL-C ("bad cholesterol")
🔸HDL-C ("good cholesterol")
🔸Triglycerides
🔸Non-HDL cholesterol
These tests remain extremely useful and form the foundation of risk assessment.
2/n
Jun 11 7 tweets 3 min read
How Much Exercise Do We Need for Cardiovascular Protection?
Most people have heard the recommendation:
✅ 150 minutes/week of moderate-to-vigorous physical activity (MVPA)
▶️But an important question remains:
Does 150 minutes provide maximum cardiovascular protection, or is it simply the minimum effective dose?
1/nImage
Image
A recent study in the British Journal of Sports Medicine helps answer this question.
✅Key Finding #1: 150 min/week works but the benefit is modest
🔸Meeting the current guideline of 150 min/week of MVPA was associated with approximately 8–9% lower cardiovascular disease risk compared with very low activity levels.
🔸However, it is not the level associated with the largest risk reductions.

✅Key Finding #2: Larger risk reductions require much more activity
🔸To achieve a >30% reduction in cardiovascular disease risk, participants generally needed around 560–610 minutes of MVPA per week
🔸This is roughly 80–90 minutes/day (4 times the minimum guideline recommendation).
2/n
Jun 8 19 tweets 4 min read
Understanding Your Lipid Profile: What Really Matters?
Many people get a lipid profile done every year but are unsure how to interpret the results. This thread explains LDL, triglycerides, HDL and ApoB in simple language.
This is mainly meant for people who have NOT suffered a heart attack or stroke and are NOT already taking statins.
Share and re-post for wider reach and bookmark for future reference. Post your queries and comments below.
1/n
How often should you check your lipid profile?
Most healthy adults should get a lipid profile at least once every 2-3 years.
More frequent testing may be needed if you have:
• Diabetes
• High blood pressure
• Obesity
• Smoking history
• Family history of premature heart disease
• Previously abnormal lipid levels
2/n
Jun 7 10 tweets 3 min read
Sharing my experiences of running
I started regularly running in November 2020 (in the 50th year of my life). This is my 6th year as a runner. During this period, I have run more than 1000 10k runs and more than 150 half marathons.
Running has resulted in several health-related benefits. Notable ones among them include about 30 Kg weight loss (I weighed about 100 Kg before I started running) and reduction in resting heart rate to 40-45 bpm (from 70-75 bpm).
In this post, I will share my experiences (as well as my learning from published research studies) about running. Like, share, re-post, bookmark this post. Post your comments and queries below.
1/n
One can start running at any age.
If you are medically fit and love running, you can start running at any age.
2/n
Jun 5 8 tweets 2 min read
Clinical Quiz
"Doctor, my uric acid is 9.2. Should I start allopurinol or febuxostat?”

A 35-year-old healthy man underwent a routine health check-up. His serum uric acid was 9.2 mg/dL.
He had:
✅ No joint pains
✅ No history of gout
✅ No kidney stones
✅ Normal day-to-day functioning

Should he be started on medicines?

#MedTwitter #NeuroTwitter The answer, in most cases, is NO.

1. High uric acid is not the same as gout
🔸Many people have elevated uric acid levels but never develop gout.
🔸The diagnosis of gout requires symptoms and signs of urate crystal deposition, not just an abnormal blood test.
Jun 2 10 tweets 2 min read
In this post, I will share a few practical points that can guide people suffering from migraine.
(Disclaimer: This is meant for general information and is not medical advice)

After reading, bookmark, share and re-post for wider reach. If you have any comments or queries, post them below.
1/n
Typical features of migraine
✅Headache lasts for 4-72 hours (if medicines are not taken)
✅Associated with nausea, vomiting, photophobia (increased sensitivity to light) and phonophobia (increased sensitivity to sounds)
✅Pain is severe enough to negatively impact personal and professional lives.
2/n
Jun 1 9 tweets 8 min read
If you are planning a trip to Sikkim, this post could be helpful. Bookmark this for future reference.
We visited Sikkim in the first week of May 2026, covering Gangtok, Nathu la and Lachung (North Sikkim). Our group had six people, including my parents in their 70s.
(1/n) Image Itinerary
Day 1: Flight from Hyderabad to Bagdogra. Road trip to Gangtok.
Day 2: Road trip from Gangtok to Lachung
Day 3: Day trip to Yumthang valley and Zero point. Return to Lachung for night stay.
Day 4: Road trip from Lachung to Gangtok
Day 5: Trip to Nathu la and Tsongo lake (from Gangtok)
Day 6: Drive from Gangtok to Bagdogra.
(2/n)