Food and Nutrition for Health: Challenges of Malnutrition
The enduring challenge of malnutritionThe MDGs aimed to cut hunger by half. Despite huge improvements between 2000–2015, globally one in nine people in the world (or 795 million people) are undernourished. Poor nutrition causes the deaths of approximately 3 million children under five per year. A related SDG, SDG 2, sets an even more challenging set of targets, with the aim to “End hunger, achieve food security and improved nutrition and promote sustainable agriculture.”How can we recognise hunger and malnutrition?When we talk about hunger we are referring to the distress associated with lack of food. The Food and Agriculture Organization of the United Nations (FAO) defines food deprivation, or undernourishment, as:
Dietary energy is typically measured in terms of calorie intake. The recommended daily allowance of calories varies according to an individual’s age, gender, and level of activity. Adult females require an average of 2,000 calories a day, and adult males an average of 2,500 calories. See the US Department of Agriculture’s figures for a more detailed breakdown.Malnutrition refers to both undernutrition and overnutrition which are both problematic.“the consumption of food that is not sufficient to provide the minimum amount of dietary energy that each individual requires to live a healthy and productive life, given his or her sex, age, stature and physical activity level.”
Undernutrition and overnutritionWhen we talk about the term undernutrition, this goes beyond calorie intake. Undernutrition means being deficient in energy, protein, or essential vitamins and minerals. It is the result of inadequate intake of food in terms of either quantity or quality, poor utilisation of nutrients due to infections or other illnesses, or a combination of these factors. Undernutrition is the underlying contributing factor in about 45% of all child deaths, making children more vulnerable to severe diseases. Malnourished children, particularly those with severe acute malnutrition, have a higher risk of death from common childhood illness such as diarrhoea, pneumonia, and malaria.
We have considered undernutrition but what about overnutrition?
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Challenges facing world malnutritionThe major challenges that countries face to reduce malnutrition are varied and complex. For example, these are some of the challenges that impact the ability of individuals and households to achieve adequate nutrition:
- Inadequate maternal or child health practices
- Inadequate access to health services
- Inadequate food supply chains in countries or regions
- Climate change
- Food insecurity
The four main dimensions of food security are:
So given the importance of food as medicine, how best can we measure how the world is facing this challenge?
The Global Hunger IndexThis is a map of the world that describes the Global Hunger Index (GHI). It highlights countries that face the challenge of hunger. GHI is a tool designed to measure and track hunger globally, regionally, and by country. The Global Hunger Index. Click here to enlargeEach year, the International Food Policy Research Institute (IFPRI) calculates GHI scores in order to assess progress, or the lack thereof, in decreasing hunger. An increase in a country’s GHI score indicates that the hunger situation is worsening, while a decrease in the score indicates an improvement in the hunger situation. A country’s GHI score is made up of 4 components:
- The proportion of the population that is undernourished
- Child stunting per population
- Child wasting per population
- Child mortality per population
Measuring nutritional status with the Body Mass IndexAnother way that health and nutritional status is often measured is using the Body Mass index (BMI). To get an individual’s BMI we measure their height and weight, and then divide their weight in kilograms by their height squared in centimetres. We then use a BMI table to determine whether a person is within a normal range for their age, or whether they may be underweight or overweight. A BMI of 18.5–25 is within the normal range. Under 18.5 is underweight, with 17–18 being mildly malnourished, 16–17 being moderately malnourished, and under 16 severely malnourished. What about the other end of the spectrum? A BMI of 25–30 is overweight and above 30 is obese. Body Mass Index ChartBMI is a common and useful measure but it is a rough measure. Nutritionists increasingly recommend using a collection of measures in order to understand nutritional status, to be able to determine the right course of treatment for under and overnutrition, and the right timing of that treatment.
Measuring nutritional status with ABCDA comprehensive measurement of nutritional status will take into account multiple measures including some, or all, of the ABCD of measures.
- A is for anthropometry; this refers to the measurement of body parameters to determine nutritional status. BMI is a common anthropometric measure.
- B is for biochemical tests; this is where we take blood or urine samples and use them to assess whether a person has adequate micronutrients.
- C is for clinical history; this is where we assess a patient’s clinical profile including symptoms and history of illness.
- D is for diet; this is where we assess a patient’s actual food intake, often using tools like 24 hour dietary recall or food frequency questionnaires.
Take a look at the Global Hunger Index score from 2017 and choose one country.
- What challenges do you think that country faces to reduce malnutrition?
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