inflammation is quite natural

Doesn't make it always a healthy process. Our bodies are not perfect systems created by a god. Inflammation can have negative effects along with positive effects. Your statement is flawed.

Many people think that natural must mean that it is the best way. Humans are so much more complicated than that.

Appearance of low-fat foods led to production of high-sugar products. That’s the reason why people develop heart issues.

Not entirely and you are just throwing your comments out there. People develop heart issues for genetic reasons as well and a low sugar diet isn't going to be the only reason people don't end up with some sort of heart disease.