As we've said time and time again, sugar as your first meal is a terrible idea. You'll spend the rest of the day chasing the sugar rush and you'll throw your whole body into turmoil in the process. Just don't do it. Sugary cereals are one of the worst culprits, you only have to take one look at their fluorescent colors and quirky shapes to know how unnatural they are. They're another one of those totally fake foods with no nutritional value whatsoever.
Some American cereals even contain carcinogenic ingredients, such as butylated hydroxytoluene or butylated hydroxyanisole, that are banned in other western countries including the UK, most of Europe, Australia, and New Zealand. If you love your cereal, switch over to a brand with no added sugar. Your body will thank you for it!