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Child Nutrition and Bone Health

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Child Nutrition and Bone Health THIEME Review Article e67 Child Nutrition and Bone Health Lucía Redondo-Cuevas1 Jesús Sanchis-Chordà1 Pilar Codoñer-Franch1,2 1 Department of Pediatrics, Obstetrics, and Gynecology, University of Address for correspondence Lucía Redondo-Cuevas, BSc, MSc, Valencia, Valencia, Spain Department of Pediatrics, Obstetrics, and Gynecology, University of 2 Department of Pediatrics, Dr. Peset University Hospital, Valencia, Avenida de Blasco Ibáñez 15, 46010 Valencia, Spain Valencia, Spain (e-mail: [email protected]). J Child Sci 2018;8:e67–e74. Abstract Nutrition is one of the modifiable factors that contributes to bone accrual during childhood and adolescence, a critical period to prevent adult osteoporosis. Calcium and vitamin D seem to be the most important nutrients for optimal bone growth. Requirements for calcium intake are different among countries and organizations, and exact recommendations are difficult to determine since other dietary factors directly affect calcium metabolism, such as salt intake and vitamin D levels. Some scientists have suggested that the actual calcium requirements are overestimated and that increased dairy intake does not necessarily translate to better bone health in adults. Moreover, calcium can be obtained from other natural foods, such as cruciferous vegetables (turnip greens, broccoli rabe, kale, broccoli, and cabbage), endive, sesame seeds, legumes, almonds, calcium-fortified vegetable beverages, and canned sardines. Vitamin D should be obtained from food combined with appropriate sun exposure, and if that is not enough, vitamin D supplements can be used. Diets Keywords comprised a complex combination of nutrients and foods, and dietary patterns in ► nutrition children and adolescents play a key role in bone formation. A dietary pattern that is ► growth high in vegetables and fruits and low in processed foods (containing large amounts of ► peak bone mass added sugar and salt) is necessary to achieve optimal bone formation. Finally, physical ► calcium absorption activity, particularly activities that apply large forces, is even more important than ► dairy dietary factors to contribute to bone accrual. Introduction Peak bone mass attained during childhood and adoles- The fetal period, early life, childhood, and puberty are critical cence determines skeletal fragility in old age.2 Peak bone periods for the development and/or programming of meta- mass is the amount of bone acquired when accrual ceases or bolic systems, including the skeleton. Osteoporosis is reaches a plateau at some point after the completion of described by the World Health Organization (WHO) as a growth and development.3 During growth and development, “progressive systemic skeletal disease characterized by low skeletal growth proceeds through the coordinated action of bone mass and microarchitectural deterioration of bone tissue, bone deposition and resorption to allow bones to expand and with a consequent increase in bone fragility and susceptibility lengthen into their adult form. This process of bone modeling to fracture.” Because of the morbidity of osteoporosis, the begins during the fetal growth period and continues until the prevention of this disease and its associated fractures is end of the second decade of life. Bone modeling is sensitive to considered essential to the maintenance of health, quality of mechanical loading, emphasizing the importance of physical life, and independence in the elderly population.1 activity throughout growth.4,5 received Issue Theme Nutrition in Child Copyright © 2018 Georg Thieme Verlag June 29, 2018 Health Conditions; Guest Editor: KG Stuttgart · New York accepted after revision Pilar Codoñer Franch, MD, PhD. July 1, 2018 DOI https://doi.org/ 10.1055/s-0038-1669402. ISSN 2474-5871. e68 Child Nutrition and Bone Health Redondo-Cuevas et al. The most frequently used clinical indication of osteoporo- women, and estrogen deficiency is associated with increased sis and fracture risk is bone mineral density (BMD). However, bone resorption and increased fracture risk. Androgens, fracture resistance is determined by several factors that are growth hormones, and insulin-like growth factor-1 promote difficult to measure: the strength of the bone, which in turn bone formation, whereas excess glucocorticoids both depends on its geometric properties (size, shape, and con- increase bone resorption and impair bone formation.12 nectivity), the activities of the cells in the tissue, and the Neighboring muscle and adipose tissue also exert significant material properties of the tissue. The material properties of control over bone remodeling.3 bone include the mineral content, mineral composition, Physical activity: Bone growth and maintenance are mineral crystal size, and collagen matrix content and com- critically stimulated by physical activity, and it is important position.6 In general, when osteoclast activity (the sole bone- at all ages.13 Regular physical activity is the key to optimizing resorbing cell) is greater than osteoblast activity (responsible peak bone mass, thus preventing osteoporosis later in life.14 for bone formation), a higher bone fragility develops.7 Low-grade inflammatory state: It has been recognized The growth and maintenance of bone tissue are complex that inflammatory cytokines of the immune system have a processes influenced by many factors (►Fig. 1): significant impact on the fine-tuned balance between bone Genetics, sex, and ethnicity: Heritable factors can explain resorption and bone formation. For example, cytokines, such 60 to 80% of the variability in bone mass and osteoporosis risk.4 as interleukin-6, interleukin-1 and tumor necrosis factor-α, Genome-wide association studies have identified more than suppress osteoblasts and stimulate osteoclast functions. 70 loci associated with adult bone density or fractures; how- Furthermore, oxidative stress and the generation of advanced ever, only a few of these studies have been conducted in glycation end products have emerged as links between inflam- children.4,8 Males tend to have higher bone density and mation and bone destruction.7 content, and they achieve it at a later age than females.9 Finally, Gut microbiota: The microbiota interacts with the host to racial differences in bone become apparent during childhood. modulate bone density through different mechanisms15: In the United States, studies of areal BMD generally show the greatest values in African Americans followed by American 1. Gut microbiota dysbiosis can lead to intestinal inflamma- white, Asian or Hispanic children.10 tion and bone inflammation. Intrauterine life: Maternal diet (particularly vitamin D 2. Dietary or prebiotic fiber reaches the lower gut where the deficiency), smoking, and physical activity modulate the resident microbiota ferments the fiber to short-chain bone mineral acquisition of the baby; moreover, both low fatty acids, which can enhance calcium absorption and birth size and poor childhood growth are directly linked to signal locally in the gut and in the bone. the risk of hip fracture later in life.11 3. The gut bacteria secrete factors and intestinal hormones, Hormonal status: Several hormones affect bone mass. such as incretins and serotonin, that are known to reg- Estrogen plays an important part in maintaining BMD in ulate bone density. Fig. 1 Factors influencing bone formation during childhood and adolescence. Journal of Child Science Vol. 8 No. 1/2018 Child Nutrition and Bone Health Redondo-Cuevas et al. e69 Tobacco and alcohol use during childhood and adoles- different expert authorities (►Table 1). Moreover, data on cence have been associated with lower bone density levels.16 calcium intakes in children is too limited to draw conclusions Many diseases, certain drugs, and toxic agents affecting about adequacy.21 children and adolescents can be associated with a reduction Ludwig and Willett suggest that the recommended level in bone accrual or a loss of bone mass and quality. For of calcium intake in the United States is based predominately example, glucocorticoids result in significant reductions in on balance studies of 3 weeks or less and likely overestimates bone formation because of the decreased differentiation of actual requirements and greatly exceeds the recommended osteoblast precursors, impaired osteoblast function, and intake in the United Kingdom.28 According to the WHO, in decreased osteoblast lifespan.3,17 countries with a high fracture incidence, only a minimum of Nutritional factors: The present review evaluates and 400 to 500 mg of calcium intake is required to prevent summarizes current evidence of nutritional factors that osteoporosis in older people.29 It has been described that promote maximal bone health from childhood through early calcium homeostasis is maintained mainly by controlling to late adolescence. gastrointestinal absorption and renal excretion of calcium. Children with low calcium intakes (227 or 359 mg/day) Nutritional Factors demonstrated a mean fractional absorption of 61 or 63.1%, respectively, approximately double that of children with Calcium calcium intakes close to the recommended dietary allowan- Calcium is one of the main bone-forming minerals; over 99% ces.30 Moreover, children with low calcium intakes also of total body calcium is found as calcium hydroxyapatite in reduce their renal excretion of calcium.30 bones and teeth, where it provides hard tissue with its Calcium requirements vary depending on dietary factors, strength. such as the intake of vitamin D,31 sodium,4 and caffeine32 the
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