We all know we should drink enough water each day to stay healthy — around 2 litres is a common guideline. If you love Coke, you might wonder whether it counts as water and if it hydrates you just as well.
This article looks at Coke versus water for hydration, clears up common questions, and helps you pick the better option.
Does drinking Coke count as water?
Coke does contain water, so it can add to your daily fluid intake. But it’s not the best choice. While it provides some hydration, it also brings sugar, calories, and caffeine — things your body doesn’t need in large amounts.
What the NHS says
The NHS recommends about 6–8 glasses of fluid a day, including water, lower-fat milk, and sugar-free drinks like tea and coffee. They advise limiting sugary drinks like Coke, especially for children. The idea is to get most of your fluids from healthier options.
Why Coke isn’t the best for hydration
The NHS Eatwell Guide recommends eating and drinking foods high in sugar, fat, and salt less often and in smaller amounts. Sugary soft drinks fit into that “less often” category. Coke is high in sugar and calories, so using it as a main fluid source can quickly add up and harm your health.
Caffeine and hydration
Coke contains caffeine, which is a mild diuretic and can make you urinate more, possibly causing fluid loss. So even though Coke gives some hydration, its caffeine and sugar make it less effective than plain water.
Is Diet Coke a better substitute?
Diet Coke is sugar-free, so it’s a better option than regular Coke and does count toward your fluid intake. But it still has artificial sweeteners and caffeine. Those sweeteners (like aspartame and acesulfame K) are controversial and may affect the gut microbiome, cravings, or insulin response — research is still ongoing. Some people also get headaches or digestive issues from them. Because of this, Diet Coke isn’t as good as plain water.
Why water is still the best
Water has no calories, sugar, or artificial additives. It supports digestion, helps regulate body temperature, aids nutrient absorption, and keeps your cells working properly. It helps your skin look healthy and keeps muscles and joints working well. For overall hydration and health, plain water is the top choice.
What if you only drink Coke and no water?
Short-term effects
Drinking only Coke might sound appealing, but it brings serious downsides. The high sugar and calorie content can cause weight gain and blood sugar spikes, leading to energy crashes and more cravings. Too much caffeine can cause jitters, anxiety, sleep trouble, and more frequent urination.
Long-term effects
Relying on Coke instead of water can increase the risk of long-term health problems like type 2 diabetes, heart disease, dental issues, and obesity. Over time, the caffeine and sugar may also contribute to ongoing dehydration and other health problems. Plus, you miss the many benefits of plain water.
Coke vs. water: the bottom line
Water wins every time as a hydration source. Coke is fine as an occasional treat, but it’s not a healthy daily replacement for water. For clearer skin, better muscle and joint function, improved brain performance, and overall health, choose plain water when you’re thirsty.