Energy drinks vs sports drinks: Top neurologist explains the key difference you’re missing

Walk into any gym or supermarket and you’ll see rows of brightly coloured cans promising instant energy, better performance and sharper focus. Many people grab them before workouts without thinking twice. But do they actually help, or are we confusing marketing with science? A Hyderabad-based neurologist has now weighed in with a detailed breakdown that challenges common assumptions about energy drinks, their purpose, and how they differ from sports drinks in ways most people completely miss.

Dr Sudhir Kumar, a Hyderabad-based neurologist, took to X to explain that “energy drinks don’t give you ‘energy’” in the way most people assume. Instead, he said they mainly deliver “caffeine, sugar and stimulants.” He added that for most people, they are not necessary for exercise, gym workouts, or sports.

Energy drinks are not sports drinks, says neurologist

Dr Sudhir Kumar was clear in separating two categories that are often wrongly used interchangeably. He explained that energy drinks and sports drinks serve completely different purposes.


He wrote that “energy drinks are NOT the same as sports drinks.” According to him energy drinks contain caffeine, sugar and other stimulants. He also added that sports drinks are designed to replace fluids, carbohydrates and electrolytes lost during prolonged exercise. He stressed that the two are “not interchangeable,” even though many people treat them as if they are.

Do energy drinks actually improve performance?

The neurologist also addressed a common belief that energy drinks automatically enhance physical performance. He noted that the evidence is mixed. Some studies suggest caffeine may help improve alertness and endurance in certain athletes. But he cautioned against generalising this to everyone.

As he explained, “that doesn’t mean everyone who goes to the gym or for a morning run needs an energy drink.”
For most recreational exercisers, he said energy drinks are unnecessary.

What most people actually need during workouts?

Dr Sudhir Kumar pointed out that for most workouts lasting under an hour, hydration needs are simple. He stated that for the majority of exercise sessions, “water is usually enough.” If additional fuel is required, he suggested simple food options instead of processed beverages. He mentioned that carbohydrate-rich foods like “a banana, fruit, dates or a simple meal” are often safer and more cost-effective than energy drinks.

When sports nutrition actually matters?

The neurologist also clarified when specialised sports nutrition becomes relevant. He said that during prolonged, high-intensity endurance activities such as marathons or long cycling events, some athletes may benefit from carbohydrates and electrolytes.

However, he added that this role is typically handled by proper sports nutrition products, not highly caffeinated energy drinks.

The risks linked to energy drinks

Dr Sudhir Kumar also highlighted the downsides of frequent energy drink consumption, pointing to their common ingredients and effects. He noted that many energy drinks contain:
- Large amounts of added sugar
- High doses of caffeine
- Multiple stimulants with combined effects that are not fully studied

He warned that “more is not better.” According to him, excessive intake has been linked to several health issues, including:

- Weight gain and obesity
- Type 2 diabetes, especially with sugar-sweetened drinks
- High blood pressure
- Sleep disturbances
Anxiety and palpitations

He also added a caution that in some people, energy drinks may even trigger dangerous heart rhythm problems.

Who should avoid energy drinks

The neurologist issued clear warnings for vulnerable groups. He said children and adolescents should avoid energy drinks completely.

He also advised that:
- Pregnant or breastfeeding women should avoid or strictly limit them due to caffeine exposure
- People with heart disease, hypertension, anxiety disorders, or sleep issues should be especially cautious

Regulatory attention adds to concerns

Dr Sudhir Kumar also referenced recent regulatory scrutiny, noting that FSSAI has sought explanations from companies over alleged mislabelling of certain caffeinated beverages marketed as energy drinks.

He pointed out that this highlights the need for accurate labelling and informed consumer choices, especially as marketing often blurs the line between energy drinks and sports drinks.

Take home message from the neurologist

Wrapping up his post, Dr Sudhir Kumar shared two key points:

- You don’t need an energy drink to exercise.
- Good nutrition, proper hydration, adequate sleep and regular training are far more effective sources of energy than a can of caffeine and sugar.