Is excessive consumption of foods rich in sugars and fats with the intention of illness, death, and ending one's life considered suicide, given the inability to limit such consumption due to depression and gluttony?

It is forbidden for a person to do that which causes certain harm, based on the hadith (definition): "There should be neither harming nor reciprocating harm." The principle is that anything harmful is prohibited. Whoever dies by such means is not considered a suicide, because their death was not a certainty. It is advised to consult psychiatrists.