This is true, frequent consumption of Redbull, and other energy drinks can cause more anxiety and stress within a person, as well as insomnia. Energy drinks have a target audience of mostly younger people, meaning that most people who drink energy drinks are young adults. This is problematic for multiple reasons, one being that redbull has a high sugar content as well as being caffeinated, so this can put people at an increased risk for things like seizures, diabetes, acute kidney injury, and strokes, which are severe outcomes that are less likely to happen than other outcomes like anxiousness, dehydration, and restlessness but the more you consume these energy drinks the higher the risk is that the more severe outcomes can happen to you as said in this source. https://pmc.ncbi.nlm.nih.gov/articles/PMC10535526/ This article also breaks down some of the components of energy drinks like redbull and explains what some of the ingredients do to the body and how they work. This article also provides the results of a study that shows the outcomes of energy drinks, and the majority had cardiac outcomes.
https://www.health.harvard.edu/nutrition/are-energy-drinks-bad-for-you . This article provides insight into the general knowledge of energy drinks like redbull and what the effects are majority of them being negative, it does, however, say that energy drinks aren't necessarily bad if you drink one just to get a quick energy boost but large quantities of drinking are bad or if you have a things like heart problems or a high blood pressure its best to avoid them which I agree with.