We all love our morning grounded coffee! Most of us can’t start the day without it. Coffee has several health benefits, such as reduced cognitive decline, improved liver health, and a lower risk of death. Coffee consumption decreased retinal vessel diameter in certain eye parts two hours after consumption. Coffee decreases cerebral blood flow.
CAFFEINE AND EYE PRESSURE SUMMARY
- There has been mixed research on caffeine and eye pressure.
- Coffee consumption decreased retinal vessel diameter in certain eye parts two hours after consumption.
- Coffee decreases cerebral blood flow.
We all love our morning grounded coffee! Most of us can’t start the day without it. Coffee has several health benefits, such as reduced cognitive decline, improved liver health, and a lower risk of death.(Gardener et al., 2021; Kositamongkol et al., 2021; Liu et al., 2022)
In the diet genre, many people use black coffee and caffeine beverages while fasting to help keep their energy sustained while trying to lose body weight. Coffee is a huge benefit for those using intermittent fasting for weight loss. Commonly asked questions regarding coffee and intermittent fasting are:
Q: Can I drink coffee with Stevia while fasting?
A: Stevia has no calories and will have very few metabolic changes. Moderate amounts of stevia are ok while fasting.
Q: What are the best coffee creamers for intermittent fasting?
A: A small amount of creamer is acceptable, but the more creamer you add to your coffee, the more calories you add to your diet. There are no differences between intermittent fasting and calorie-controlled diets for weight loss. You should be concerned about total calories, so a small amount of creamer will not have a meaningful effect.
I have written several articles on how caffeine affects performance and the benefits of drinking coffee before working out. The International Society of Sports Nutrition has documented the pros and cons of drinking coffee before a workout.
Many people have debated using coffee vs. a pre-workout caffeinated beverage for performance, but both are equally effective. The pros of caffeine are enhanced focus, performance, and increased fat burning. The drawbacks of too much caffeine are insomnia, addiction, and anxiety. A new study has found that coffee may contribute to worsening eye health.
CAFFEINE AND EYE PRESSURE
Some people have reported excessive coffee, and energy drinks cause vision disturbances such as eye twitching and blurred vision (i.e., caffeine vision disturbances). High-dose caffeine consumption is associated with glaucoma. (Kim et al., 2021) However, more research is needed on caffeine and eye health.
Studies have reported conflicting results on eye blood flow and caffeine intake. Studies have reported both increases and decrease in blood flow intake. (Karti et al., 2019; Noguchi et al., 2015; Tesselaar et al., 2017) The eye microvasculature is sensitive to pressure and free radical damage; this is why diabetics often suffer eye damage (i.e., diabetic retinopathy). (Newman et al., 2018)
Researchers from China examined the effect of coffee consumption, eye pressure, and retinal parameters related to blood vessels in the eyes. All the subjects in the study were regular coffee consumers (<2.5 cups per day) and were assigned to drink coffee one day, and another day they just drank water. The subjects were placed in an MRI machine to measure the changes.
The study found that coffee consumption decreased retinal vessel diameter in certain parts of the eye two hours after consumption. Interestingly, there were no changes in heart rate. The study authors referenced that caffeine is an adenosine receptor antagonist. Adenose is a potent vasodilator (i.e., it increases blood flow). (Schwabe et al., 1985)