The idea is that when kidney function is impaired, the body’s ability to handle waste and regulate fluids and electrolytes is reduced, so the diet is adjusted to ease that workload. Limiting protein lowers the amount of nitrogenous waste the damaged kidneys must process, which can lessen symptoms and slow disease progression. Reducing sodium helps control blood pressure and decrease fluid retention and edema, both common when the kidneys aren’t excreting fluids and electrolytes efficiently. Together, these dietary tweaks form a renal-focused plan to protect remaining kidney function and maintain balance. Other conditions may benefit from diet changes too, but the combination of restricted protein and sodium is a hallmark of renal-diet management in chronic kidney disease.

Vitamins have common names and chemical names. For Vitamin E, the chemical name used in science is tocopherol (with alpha-tocopherol as the main active form in humans). So tocopherol is another name for Vitamin E. The other options refer to different vitamins: Vitamin A is retinol (or carotenoids), Vitamin B refers to the B-complex vitamins, and Ascorbic Acid is Vitamin C.

Long-term average blood glucose control is best reflected by the HbA1c test because it measures the amount of glucose that has permanently attached to hemoglobin over the life span of red blood cells. Since red blood cells circulate for about 120 days, HbA1c provides an integrated view of average glucose exposure over roughly two to three months. Higher average glucose leads to more glycation and a higher HbA1c percentage, which is why this test tracks chronic control rather than a single moment in time. The other measures capture more immediate states: fasting plasma glucose is a snapshot after an overnight fast, the oral glucose tolerance test assesses how the body handles a glucose load at one point in time, and random plasma glucose reflects glucose levels influenced by recent meals. HbA1c remains the best indicator of long-term control, though it can be affected by conditions that alter red blood cell turnover.

Start with the energy per gram for each macronutrient: carbohydrates 4 kcal/g, protein 4 kcal/g, fat 9 kcal/g. To find daily grams from a total of 2100 kcal with a 50/20/30 distribution, multiply 2100 by each percentage and then divide by the relevant kcal per gram. Carbohydrates: 50% of 2100 = 1050 kcal; 1050 ÷ 4 ≈ 262.5 g → about 262–263 g. Protein: 20% of 2100 = 420 kcal; 420 ÷ 4 = 105 g. Fat: 30% of 2100 = 630 kcal; 630 ÷ 9 = 70 g. Total energy checks out: 1050 + 420 + 630 = 2100 kcal. This yields approximately 262–263 g carbs, 105 g protein, and 70 g fat, which matches the given correct option. Other choices deviate from these gram amounts or would not sum to 2100 kcal when using 4 kcal/g for carbs and protein and 9 kcal/g for fat.