Investigating the Antidiabetic Effects of Calotropis procera: Preclinical Assessment.

Accurate assessment of dietary intake is a complex, yet critical pillar of the relationship between dietary quality and health. Numerous tools exist to assess dietary intake that differ in reliability and user burden for both researchers and respondents. Objective tools for dietary assessment include the doubly labelled water method and assessment of urinary biomarkers. Both methods show strong correlations with subjects’ dietary intake and are not impacted by reporting bias; however, these methods are expensive and involve complex technical analysis that make them difficult to apply to large samples or over a longer duration. Conversely, self-reported dietary assessment tools offer a lower burden option to dietary assessment, requiring participants to report their dietary intake in response to prompts using questionnaires, researcher-led interviews or food diaries, but are prone to reporting bias. Despite this, subjective dietary assessment tools are relatively easy to implement in larger, longitudinal studies and are therefore widely used. Food frequency questionnaires (FFQs) allow for assessment of habitual dietary intake, ranging from one month to one year. FFQs can be used to assess dietary intake at both the nutrient and food levels. This facilitates a food-first approach to dietary analysis, making it possible to assess the relationship between diet and health beyond nutrient composition alone. However, the capacity of existing FFQ tools to measure food and nutrient exposure in the current varied food environment, including high resolution at the food level, is restricted. In most FFQs, food items are grouped into composite categories (e.g. whole grains, legumes and pulses, dark leafy greens, spreads). This prohibits the quantification of individual item intake and more granular assessment of associations between foods and health outcomes. This is a significant limitation given current advancements in our understanding of the chemical and structural complexity of single foods and the subsequent impact of the food matrix on nutrient bioavailability and absorption. Given the limitations of current FFQs there is a need for a tool that captures high resolution data at the food level, allowing assessment of the relationships between foods and food groups consumed as part of modern diets and health outcomes. The primary objectives of this work were 1) to develop a self-administered, quantitative, online FFQ that captures intake of discrete dietary items commonly consumed in modern diets, with greater resolution at the food level in comparison to existing methods and 2) to determine the relative validity of the FFQ for the quantification of food and nutrient intake among adults in the UK. An average of multiple administrations of dietary recalls is considered the ‘gold standard’ in assessing habitual intake. Therefore, the FFQ developed for this study is compared to multiple administrations of an online, self-administered 24-h recall tool Intake24 () in an adult population in the UK.