Diet Coke may have more significant effects on the body than many people realise11:10, 11 Jul 2026Updated 07:16, 13 Jul 2026A pharmacist has highlighted the immediate physical reactions that can occur within just one hour of drinking a chilled can – ranging from dental problems to elevated blood sugar levels and increased thirst. While consuming Diet Coke occasionally is typically regarded as relatively safe, excessive consumption could potentially result in weight gain and even depression, according to some studies.‌This worry primarily focuses on aspartame, a key component in Diet Coke, which was labelled "possibly carcinogenic" by the World Health Organisation (WHO) in 2024, although they noted this designation was based on "limited evidence". The Mirror has documented the timeline of Diet Coke's effects on the body at different intervals: 10, 20, 40, and 60 minutes following consumption.‌The 'Renegade Pharmacist', Niraj Naik, gained attention in 2015 with his infographic documenting these reactions, claiming, according to the Daily Record, that tooth enamel starts eroding as soon as ten minutes after drinking, reports Surrey Live.‌'Cure' for grey hair close, first artificial cells created, humans and Neanderthals lived together, the world's fastest spider, and a ‘once-in-a-millennium’ chance to see an asteroid - all this and more in our weird science newsletterNaik explained: "The phosphoric acid attacks the enamel in your teeth, while the artificial sweeteners like aspartame hit your system. Aspartame may trigger taste receptors and trick your body into thinking it has just processed sugar."‌While Diet Coke contains no sugar or calories, excessive consumption has been associated with potential health risks, including heightened risk of certain heart conditions, kidney issues, and bone density loss, as well as possible disruption of gut health due to artificial sweeteners.Healthline found that regular consumption of diet fizzy drinks, despite containing no calories, could be associated with weight gain.There are also several effects of diet fizzy drinks which have produced mixed results and require further research. This includes reductions in fatty liver, alterations to the gut microbiome, tooth decay, links to osteoporosis, and associations with depression.‌The effects of Diet Coke on the body just one hour after drinking20 minutesWithin 20 minutes of drinking a Diet Coke, Nimai Naik highlights that the body enters "fat storage mode", referencing data from The Nurses' Health Study which links such beverages with an increased risk of hypertension and type two diabetes. Naik states: "Like regular Coke, this can trigger insulin, which sends your body into fat storage mode."40 minutes‌As the 40-minute mark arrives, Naik suggests that the combination of caffeine and aspartame found in Diet Coke can produce a temporary high similar to that created by cocaine. With regular consumption, he cautions, "The potentially deadly combination of caffeine and aspartame creates a short addictive high similar to the way cocaine works."Naik strikes a cautionary tone, warning: "Excitotoxins are released which may exhaust your brain by overstimulating its neuroreceptors, especially if consumed on a regular basis."60 minutesArticle continues belowAn hour after drinking a Diet Coke, Naik warns that consumers may feel hungrier and thirstier than before, potentially steering them towards sugary or unhealthy snacks. He said: "Unlike the small amount of satisfaction you get from regular Coke, your body may still crave sweets. This makes you likely to reach for another soda, or worse, some other junk food you consider to be safe, and the cycle continues."He rounds off with a stark warning: "A can of Diet Coke provides no nourishment and would replace a more nutritious drink you could have drunk, while potentially depleting your body of essential minerals."It will never quench your thirst as it dehydrates rather than hydrates your body. A lack of vital water can lead to brain fog, poor concentration, fatigue, and feeling irritable."