Eat One a Day: Benefits for Diabetes, Eyes, Gut, Liver, and Skin

If you're overwhelmed by all the health advice out there and just want one simple thing to add to your routine, here it is: eat one medium carrot every day. Below, we'll cover exactly what carrots do for your body, how much to eat, the best way to prepare them, whether people with diabetes can eat them safely, and whether smokers need to be concerned.

1. Carrots Are Great for People with Diabetes

A study published in Nutrients, an international SCI-indexed journal, analyzed data from over 3,800 men and women and found that higher carotenoid intake from carrots was associated with a significantly lower risk of developing type 2 diabetes. Carotenoids — the group of pigments that includes the well-known beta-carotene and lycopene — help reduce inflammation and oxidative stress in vascular endothelial cells and may help prevent early-stage atherosclerosis. This is especially important for people with diabetes, who need to closely manage cardiovascular disease risk.

People with diabetes still need carbohydrates, but choosing the right kind matters. Carrots are a healthy carbohydrate option, similar to whole grains and legumes. One medium carrot contains roughly 9.5g of sugar and 6g of dietary fiber. That fiber-to-sugar ratio means carrots have a minimal impact on blood glucose — making them a practical choice for a diabetes-friendly diet.

The Truth About Carrots and the Glycemic Index

A common misconception has caused many people with diabetes to avoid carrots: the widely circulated claim that carrots have a glycemic index (GI) of 83. That figure is inaccurate.

According to the Glycemic Index Research Institute at the University of Sydney — one of the few institutions that measures GI under internationally standardized protocols — raw carrots have a GI of just 16. Boiled carrots come in at 32. Even when carrots are peeled, thoroughly cooked, and finely pureed to maximize absorption, the GI only reaches 60. It's hard to reconcile a GI of 83 with a vegetable this high in fiber, especially compared to white rice, which clocks in at 86. The 83 figure most likely originated from a non-standardized measurement and spread without verification. The bottom line: carrots are actually a diabetes-friendly food.

2. Carrots Support Eye Health

Carrots are probably the most well-known food for eye health, and for good reason. They're rich in beta-carotene and lutein, two antioxidants that protect the eyes from oxidative damage. Beta-carotene, the pigment responsible for carrots' orange color, is converted by the body into vitamin A. Vitamin A is essential for producing rhodopsin, a light-sensitive pigment in the retina that plays a key role in preventing night blindness and supporting healthy vision development.

3. Carrots Are Excellent for Gut Health

Your gut is home to roughly 100 trillion microorganisms — about 2 kilograms worth — forming an ecosystem as complex as a rainforest. The dietary fiber in carrots acts as a prebiotic, feeding the beneficial bacteria in your gut. A thriving gut microbiome has far-reaching effects on immune function, mental health, and overall well-being.

People who eat carrots daily commonly report two noticeable improvements: better skin and relief from constipation. If gut health is something you've been struggling with, adding a daily carrot is a low-effort, high-payoff habit worth trying.

4. Carrots Support Liver Function

Carrots are among the richest dietary sources of beta-carotene of any whole food. Beta-carotene has the ability to influence cell growth, which means it may help suppress the growth of abnormal cells and, importantly, support the repair and regeneration of liver cells. When the liver begins functioning more efficiently and detoxification improves, one of the first visible signs is a clearer, more radiant complexion.

5. Carrots Are Good for Your Skin

A 2010 study from the USDA Human Nutrition Research Center on Aging found that consuming natural carotenoid sources like carrots may help protect the skin from UV-induced damage. Carrots are also a solid source of vitamin C, which supports collagen synthesis and helps brighten skin tone. Antioxidants — particularly vitamin C — are fundamental to skin health. People who consistently eat carrots often notice a meaningful improvement in their complexion over time, gradually revealing what their skin looks like without the burden of processed food toxins.

How to Choose, Prepare, and Eat Carrots

Choosing the Right Carrot

When shopping for carrots, always go for the deepest orange color you can find. The carotenoids responsible for carrots' health benefits are the same pigments that give them their color. Deeper color means higher carotenoid content. Most of these carotenoids are concentrated in the skin, so eat the carrot with the skin on.

What About Pesticides?

Regulations on pesticide use in agriculture are strict — farmers must adhere to approved application limits and banned substances lists, and produce that exceeds residue limits cannot legally reach consumers. That said, if you want extra peace of mind, soak carrots in a diluted vinegar solution for about five minutes, then rinse under running water. This is effective at removing any residual fat-soluble pesticide traces, since carrots can absorb lipid-soluble compounds.

How to Prepare Carrots for Maximum Nutrition

Beta-carotene is not well-absorbed from raw carrots. Lightly cooking carrots can increase beta-carotene bioavailability by up to seven times. For best results, lightly steam or blanch them. Then pair with a tablespoon of olive oil — since most of the beneficial compounds in carrots are fat-soluble, eating them with a healthy fat dramatically boosts absorption. People who find raw carrots irritating to the throat often have no issue with lightly cooked carrots, so if raw carrots haven't worked for you, cooked carrots are absolutely worth trying.

How Much Should You Eat?

One medium carrot per day is the right amount. Avoid blending or juicing if possible — this breaks down the dietary fiber that makes carrots effective for blood sugar control and gut health. Eat them whole. One more thing: if you eat a lot of carrots, you might notice a temporary yellowing or reddening of the skin. This is caused by carotenoid pigments and is completely harmless.

Can't Eat Carrots? Try Tomatoes Instead

If carrots aren't an option for you, tomatoes are the next best thing. Tomatoes are the richest dietary source of lycopene — a carotenoid with similar antioxidant properties. Aim for one large tomato per day. Like carrots, tomatoes should be lightly cooked and eaten with a tablespoon of olive oil to maximize lycopene absorption.

Are Carrots Safe for Smokers?

You may have seen conflicting information on this topic. There is research suggesting that long-term, high-dose beta-carotene supplementation in smokers may increase the risk of lung cancer — but this was observed with supplement doses far exceeding what you'd get from food. Multiple studies have found no link between eating beta-carotene-rich foods and lung cancer risk in smokers. The consensus among nutrition experts is that the amount of beta-carotene in a daily carrot is too small to pose any risk, and the overall health benefits of eating carrots outweigh any theoretical concern. Smokers can — and should — eat carrots.

Summary

Carrots support blood sugar control, eye health, gut health, liver function, and skin quality.
Eat one medium carrot per day, lightly cooked, with the skin on and a drizzle of olive oil.
The widely cited GI of 83 for carrots is inaccurate — the actual GI ranges from 16 (raw) to 32 (boiled).
If carrots don't work for you, substitute with one large tomato prepared the same way.
Smokers can safely eat carrots — the concern applies only to high-dose beta-carotene supplements, not food.