Harold Simmons Center for Chronic Disease Research and Epidemiology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 West Carson Street, C1-Annex, Torrance, CA 90509-2910, USA.
Clin J Am Soc Nephrol. 2010 Mar;5(3):519-30. doi: 10.2215/CJN.06080809. Epub 2010 Jan 21.
In individuals with chronic kidney disease, high dietary phosphorus (P) burden may worsen hyperparathyroidism and renal osteodystrophy, promote vascular calcification and cardiovascular events, and increase mortality. In addition to the absolute amount of dietary P, its type (organic versus inorganic), source (animal versus plant derived), and ratio to dietary protein may be important. Organic P in such plant foods as seeds and legumes is less bioavailable because of limited gastrointestinal absorption of phytate-based P. Inorganic P is more readily absorbed by intestine, and its presence in processed, preserved, or enhanced foods or soft drinks that contain additives may be underreported and not distinguished from the less readily absorbed organic P in nutrient databases. Hence, P burden from food additives is disproportionately high relative to its dietary content as compared with natural sources that are derived from organic (animal and vegetable) food proteins. Observational and metabolic studies indicate nutritional and longevity benefits of higher protein intake in dialysis patients. This presents challenges to providing appropriate nutrition because protein and P intakes are closely correlated. During dietary counseling of patients with chronic kidney disease, the absolute dietary P content as well as the P-to-protein ratio in foods should be addressed. Foods with the least amount of inorganic P, low P-to-protein ratios, and adequate protein content that are consistent with acceptable palatability and enjoyment to the individual patient should be recommended along with appropriate prescription of P binders. Provision of in-center and monitored meals during hemodialysis treatment sessions in the dialysis clinic may facilitate the achievement of these goals.
在慢性肾脏病患者中,高膳食磷(P)负担可能会加重甲状旁腺功能亢进和肾性骨营养不良,促进血管钙化和心血管事件,并增加死亡率。除了膳食 P 的绝对量外,其类型(有机与无机)、来源(动物与植物来源)和与膳食蛋白质的比例也可能很重要。由于基于植酸盐的 P 在胃肠道的吸收有限,因此种子和豆类等植物性食物中的有机 P 的生物利用度较低。无机 P 更容易被肠道吸收,其在加工、保存或强化食品或含有添加剂的软饮料中的存在可能未被报告,并且与营养数据库中不易吸收的有机 P 无法区分。因此,与天然来源(源自动物和植物的食物蛋白)相比,食品添加剂的 P 负担与其膳食含量相比不成比例地高。观察性和代谢研究表明,透析患者摄入较高蛋白质具有营养和长寿益处。这给提供适当的营养带来了挑战,因为蛋白质和 P 的摄入量密切相关。在对慢性肾脏病患者进行饮食咨询时,应考虑膳食 P 的绝对含量以及食物中的 P 与蛋白质的比例。应推荐含有最少无机 P、低 P 与蛋白质比例以及足够蛋白质含量的食物,这些食物要与个体患者可接受的口感和享受相协调,并适当开具 P 结合剂处方。在透析诊所的血液透析治疗期间提供中心提供和监测的膳食可能有助于实现这些目标。