The Major Packaged Food Sources of Sodium for New Zealand Children and Trends in the Sodium Content of Commonly Consumed Foods

In children, diets high in sodium and low in potassium lead to increased blood pressure and risk of cardiovascular disease later in life. This study aimed to describe the major packaged food sources of sodium for New Zealand children aged 5 to 14 years and explored changes in the sodium content of these foods. Descriptive secondary analysis of 24 h dietary recall data from the 2002 National Children Nutrition Survey was undertaken to identify the major sources of sodium for children, and linear regression using Nutritrack data was used to assess changes in the sodium content of these foods from 2013 to 2019. For all NZ children, the major packaged food sources of sodium were white bread (contributing 23.1% to sodium intake),sausages (4.2%), ham (4.0%), canned spaghetti (3.5%) and wholemeal bread (3.2%). The results were comparable when analysed by gender, although boys attained more sodium from wholemeal bread and canned baked beans than girls (3.8% vs. 2.3% and 3.9% vs 1.8%, respectively). By age, white bread was the top contributor to sodium intake (25.6% for children aged 5–6 years and 22.6% for children aged 7–10 years and 11–14 years). Differences by ethnicity show that white bread made sodium contributions of 27.2% for Māori, 32.5% for Pacific and 20.6% for New Zealand European and others (NZEO). Sodium obtained from noodles was also higher among Māori and Pacific children (3.3% and 4.7%, respectively) than NZEO children (2.3%) as was sodium attained from extruded snacks and other crisps (Māori 2.0%, 2.5% Pacific and 0.9% NZEO). From 2013 to 2019, a significant decrease of 0.2 mg/100 g (95% CI: −70.2, −13.5) was found in the sodium content of white bread and whole hams and similar products (−0.4 mg/100 g, 95% CI: −636.2, −151.0) but an increase in the sodium content of noodles (0.2 mg/100 g, CI: 197.7, 703.2) over the same period of time. Understanding the major contributing packaged food sources of sodium and potassium for diverse New Zealand children is essential in protecting against future risk of cardiovascular disease and impetus for future public health initiatives aimed at reducing sodium intake.