You're might be consuming too much sugar, or perhaps you are fine and they are looking at the wrong cholesterol (not looking at the data correctly).
A diet that is high in sugar, particularly in the absence of fibre, will cause your liver to metabolize the fructose in sugar into a type of LDL (Low Density Lipoprotien) that is bad for your health.
Your cholesterol levels may not mean anything though, it depends on the type of cholesterol. You'll want to have low triglyceride levels and high HDL (High Density Lipoprotien) levels.
The mainstream health and dietary advice for the last 50+ years, since the Ancel Keys Seven Countries Study which was used as the basis for recommending the drastic reduction in fat from the diet. That study was fatally flawed in that it did not correct for sugar consumption, so found a spurious correlation that was then used to further reinforce the problem. And now we have the "Obesity Epidemic"
An interesting video to watch on this would be "Sugar: The Bitter Truth" by Dr Robert Lustig
Sugar is bad for you that I agree.
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