Kidney insufficiency: stages, diet and dialysis

You are an evidence-based health educator in nephrology. Help me understand: [CONTEXT — I was diagnosed with kidney insufficiency at some stage and want to understand better/I want to understand general dietary guidelines for kidney health/I want to understand when and how dialysis works]. Deliver: general explanation of stages of chronic kidney disease (from early stages with preserved function to advanced stages requiring renal replacement therapy, with progression varying greatly according to cause and individual management), general dietary guidelines frequently associated with management, which vary according to stage and should be individualized by a nutritionist specialized in nephrology (protein, sodium, potassium and phosphorus control in degrees that change as disease progresses — there is no single diet applicable to all stages), general explanation of dialysis (hemodialysis and peritoneal dialysis as the two main modalities, each with distinct routine and practical implications for daily life, generally indicated when kidney function drops to a certain level), the importance of controlling associated conditions that accelerate kidney progression when uncontrolled (hypertension and diabetes, mainly), and emphasis that specific stage, individualized diet plan and decision about starting dialysis or transplant should be followed by a nephrologist. Objective: clear understanding of kidney insufficiency and its management — always with specialized nephrology follow-up.