A high-sugar diet increases the risk of diabetic retinopathy: Ophthalmologist shares signs to watch out for

Know how a high-sugar diet increases the risk of diabetic retinopathy and learn to identify key signs for early diagnosis for the sake of your eye health.

If you have a sweet tooth and are curious about how sugary foods impact your eyesight, it's important to know about diabetic retinopathy. This serious eye condition can get worse from a diet high in sugar and refined carbs. While it mainly affects people with diabetes, anyone who eats too much sugar may also be at risk. Look out for signs like blurred vision, trouble seeing at night, and seeing floating spots or dark shadows. These can signal damage to the blood vessels in your retina. Early detection is important for protecting your eyesight.

Consuming high amounts of sugar can alter your fat metabolism in ways that could increase your risk of diabetic retinopathy. (Adobe Stock)

By Tavishi Dogra

Tavishi Dogra is a Deputy Chief Content Producer, Health & Wellness, at Hindustan Times. She has over 9 years of experience writing about fitness, nutrition, and mental well-being, translating medical research and expert insights into practical advice readers can trust.

Career journey and experience
Tavishi began her health journalism journey in 2017, and has since reported for RSTV, Financial Express, Jagran, HT Media Labs and Zee. She joined Hindustan Times to simplify wellness subjects by cutting through jargon.

From decoding health trends and interviewing doctors to testing fitness routines herself, Tavishi always approaches content with one filter: “Will this help someone make a better decision today?”

Subject expertise
With 9+ years tracking India’s health conversations, Tavishi knows the gap between clinical advice and daily life. She knows fads from fundamentals and curates science-backed, expert-recommended solutions.

In fitness, she breaks down bodyweight training, recovery, and posture fixes for desk-bound readers. In nutrition, she translates guidelines into affordable, desi meal tweaks. In mental well-being, she focuses on stigma-free, actionable tools — all backed by research, expert input, and lived context.

Education and professional background
Tavishi holds a Master’s degree in Journalism and Mass Communication and began her career reporting on public affairs for broadcast. Those early years in policy and TV shaped how she writes today: fast, factual, and human-first.

Editorial Philosophy
I write with one single goal: To simplify health in a world full of noise by finding what’s actually doable, safe, and evidence-based for my readers. I test claims against research and user experiences. When all else fails, I speak to the expert who sees 50 patients a day, not the one with the most followers.

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What is diabetic retinopathy?

Diabetic retinopathy refers to changes in the retinal vasculature caused by high blood sugar levels over time. "When glucose in the bloodstream binds with lipids and proteins, it creates harmful compounds known as advanced glycation end products (AGEs)", Dr Digvijay Singh, Ophthalmologist, tells Health Shots.

What is the link between sugar and AGEs?

Research published in Experimental Gerontology highlights a direct connection between high levels of AGEs and the severity of diabetic retinopathy. The crux of the matter is that chronic, elevated levels of AGEs can wreak havoc on the body, as per Advances in Nutrition. Imagine your eyes constantly facing damage due to these compounds; definitely not a pleasant image, right?

What are the risks of high sugar intake?

So, how exactly does a high-sugar diet lead to an increased risk of this eye condition? When we frequently indulge in sugary foods such as candies, desserts, and sweetened beverages, our bodies produce more AGEs. It’s not just people with diabetes at risk; even those who are prediabetic or have regular diets high in sugar are affected, as per the National Institute of diabetes and Digestive and Kidney Diseases.

"Repeatedly consuming high-glycemic index foods, particularly sugar-laden snacks like Indian sweets and sodas, can lead to irreparable damage over time. Even occasional sugar indulgences can cause the formation of these harmful combinations," says the ophthalmologist.

What happens in the eyes?

AGEs cause oxidative stress by disrupting the redox cycle in your body. This stress leads to inflammation in the retina, damaging the blood vessels, as per the journal Antioxidants.

The resulting issues can include:

1. Leaky blood vessels: Instead of delivering nutrients effectively, the damaged vessels leak fluid, causing swelling and blurriness in vision, as per the American Academy of Ophthalmology.
2. Abnormal blood vessel growth: This phenomenon, known as neovascularisation, leads to the creation of fragile vessels that can rupture, according to the American Academy of Ophthalmology. Imagine trying to navigate through a foggy street; that's how vision can feel in such scenarios.
3. Retinal detachment: "In severe cases, the tension from these abnormal vessels can cause the retina to detach, leading to severe vision loss", explains the expert.

What are the warning signs of diabetic retinopathy?

Being in tune with your body can help you catch possible signs of diabetic retinopathy early. Here’s what to keep an eye on:

1. Blurred or distorted vision: If you notice that your vision seems hazy or warped, it could be a sign of fluid leaking into the retina, as per the National Eye Institute.
2. Floaters or dark spots: These little nuisances are often harmless, but if they appear in excess or change suddenly, it’s time to check in with your eye doctor.
3. Difficulty seeing at night: "Struggling to see well in low light can be a precursor to retinal issues", shares Dr Singh.
4. Vision loss: This severe sign should prompt immediate medical attention. Don’t wait, get an eye exam!

How to protect your vision?

Now that we've shed light on the risks, let’s discuss how you can proactively protect your vision! The ophthalmologist shares tips to prevent diabetic retinopathy:

1. Rethink your diet: Limit high-sugar foods and replace them with healthier options. Think about incorporating more fruits, vegetables, and whole grains that maintain stable blood sugar levels, as per Frontiers in Nutrition.
2. Stay active: Regular exercise increases your metabolism, which can help reduce oxidative stress on the retina. Aim for at least 150 minutes of moderate aerobic activity each week, according to the UK’s National Health Institute.
3. Monitor blood sugar levels: Keeping your diabetes in check is important. Work with your healthcare provider to manage your glucose levels, as consistent monitoring can make all the difference, as per the National Institute of diabetes and Digestive and Kidney Diseases.
4. Routine eye exams: Schedule regular visits to your ophthalmologist, even if you don’t notice any changes, as per the National Institute on Aging. Early detection is key to preserving your vision.