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"Nutritional Requirements"
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A conversation about healthy eating
A Conversation about Healthy Eating brings together all the relevant science about healthy eating in one place, and it's exactly that - a conversation. This in-depth analysis leads to the simple conclusion that the specifics of what you eat don't actually matter; staying lean and healthy simply requires avoiding the over-consumption of processed foods. While that is, of course, easier said than done, science also provides clear recommendations for how you can adapt your environment and lifestyle to make it possible.
Book
The nature of nutrition
Nutrition has long been considered more the domain of medicine and agriculture than of the biological sciences, yet it touches and shapes all aspects of the natural world. The need for nutrients determines whether wild animals thrive, how populations evolve and decline, and how ecological communities are structured.The Nature of Nutritionis the first book to address nutrition's enormously complex role in biology, both at the level of individual organisms and in their broader ecological interactions.
Stephen Simpson and David Raubenheimer provide a comprehensive theoretical approach to the analysis of nutrition--the Geometric Framework. They show how it can help us to understand the links between nutrition and the biology of individual animals, including the physiological mechanisms that determine the nutritional interactions of the animal with its environment, and the consequences of these interactions in terms of health, immune responses, and lifespan. Simpson and Raubenheimer explain how these effects translate into the collective behavior of groups and societies, and in turn influence food webs and the structure of ecosystems. Then they demonstrate how the Geometric Framework can be used to tackle issues in applied nutrition, such as the problem of optimizing diets for livestock and endangered species, and how it can also help to address the epidemic of human obesity and metabolic disease
Drawing on a wealth of examples from slime molds to humans,The Nature of Nutritionhas important applications in ecology, evolution, and physiology, and offers promising solutions for human health, conservation, and agriculture.
eBook
Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate
Dietary Reference Intakes
for Water, Potassium, Sodium, Chloride, and Sulfate
The Dietary Reference Intakes (DRIs) are quantitative estimates of nutrient
intakes to be used for planning and assessing diets for healthy people. This
new report, the sixth in a series of reports presenting dietary reference values
for the intakes of nutrients by Americans and Canadians, establishes
nutrient recommendations on water, potassium, and salt for health maintenance
and the reduction of chronic disease risk.
Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate
discusses in detail the role of water, potassium, salt, chloride, and sulfate in
human physiology and health. The major findings in this book include the
establishment of Adequate Intakes for total water (drinking water, beverages,
and food), potassium, sodium, and chloride and the establishment of
Tolerable Upper Intake levels for sodium and chloride. The book makes
research recommendations for information needed to advance the understanding
of human requirements for water and electrolytes, as well as
adverse effects associated with the intake of excessive amounts of water,
sodium, chloride, potassium, and sulfate. This book will be an invaluable
reference for nutritionists, nutrition researchers, and food manufacturers.
eBook
Hypovitaminosis C and vitamin C deficiency in critically ill patients despite recommended enteral and parenteral intakes
Background
Vitamin C is an essential water-soluble nutrient which cannot be synthesised or stored by humans. It is a potent antioxidant with anti-inflammatory and immune-supportive roles. Previous research has indicated that vitamin C levels are depleted in critically ill patients. In this study we have assessed plasma vitamin C concentrations in critically ill patients relative to infection status (septic shock or non-septic) and level of inflammation (C-reactive protein concentrations). Vitamin C status was also assessed relative to daily enteral and parenteral intakes to determine if standard intensive care unit (ICU) nutritional support is adequate to meet the vitamin C needs of critically ill patients.
Methods
Forty-four critically ill patients (24 with septic shock, 17 non-septic, 3 uncategorised) were recruited from the Christchurch Hospital Intensive Care Unit. We measured concentrations of plasma vitamin C and a pro-inflammatory biomarker (C-reactive protein) daily over 4 days and calculated patients’ daily vitamin C intake from the enteral or total parenteral nutrition they received. We compared plasma vitamin C and C-reactive protein concentrations between septic shock and non-septic patients over 4 days using a mixed effects statistical model, and we compared the vitamin C status of the critically ill patients with known vitamin C bioavailability data using a four-parameter log-logistic response model.
Results
Overall, the critically ill patients exhibited hypovitaminosis C (i.e., < 23 μmol/L), with a mean plasma vitamin C concentration of 17.8 ± 8.7 μmol/L; of these, one-third had vitamin C deficiency (i.e., < 11 μmol/L). Patients with hypovitaminosis C had elevated inflammation (C-reactive protein levels;
P
< 0.05). The patients with septic shock had lower vitamin C concentrations and higher C-reactive protein concentrations than the non-septic patients (
P
< 0.05). Nearly 40% of the septic shock patients were deficient in vitamin C, compared with 25% of the non-septic patients. These low vitamin C levels were apparent despite receiving recommended intakes via enteral and/or parenteral nutritional therapy (mean 125 mg/d).
Conclusions
Critically ill patients have low vitamin C concentrations despite receiving standard ICU nutrition. Septic shock patients have significantly depleted vitamin C levels compared with non-septic patients, likely resulting from increased metabolism due to the enhanced inflammatory response observed in septic shock.
Journal Article
Nutritional and greenhouse gas impacts of removing animals from US agriculture
As a major contributor to agricultural greenhouse gas (GHG) emissions, it has been suggested that reducing animal agriculture or consumption of animal-derived foods may reduce GHGs and enhance food security. Because the total removal of animals provides the extreme boundary to potential mitigation options and requires the fewest assumptions to model, the yearly nutritional and GHG impacts of eliminating animals from US agriculture were quantified. Animal-derived foods currently provide energy (24% of total), protein (48%), essential fatty acids (23–100%), and essential amino acids (34–67%) available for human consumption in the United States. The US livestock industry employs 1.6 × 10⁶ people and accounts for $31.8 billion in exports. Livestock recycle more than 43.2 × 10⁹ kg of human-inedible food and fiber processing byproducts, converting them into human-edible food, pet food, industrial products, and 4 × 10⁹ kg of N fertilizer. Although modeled plants-only agriculture produced 23% more food, it met fewer of the US population’s requirements for essential nutrients. When nutritional adequacy was evaluated by using least-cost diets produced from foods available, more nutrient deficiencies, a greater excess of energy, and a need to consume a greater amount of food solids were encountered in plants-only diets. In the simulated system with no animals, estimated agricultural GHG decreased (28%), but did not fully counterbalance the animal contribution of GHG (49% in this model). This assessment suggests that removing animals from US agriculture would reduce agricultural GHG emissions, but would also create a food supply incapable of supporting the US population’s nutritional requirements.
Journal Article
European food-based dietary guidelines: A comparison and update
The aim of this study was to review and update information about food-based dietary guidelines (FBDGs) used by European countries.
FBDGs from 34 European countries were collected and their pictorial representations, food groupings, and associated messages of healthy eating and behavior were compared.
FBDGs from 34 European countries were collected, representing 64% (34 of 53) of all European countries; 74% (28 of 34) are European Union members. Of these FBDGs, 67% (23 of 34) adopt the pyramid as a food guide illustration, and classify foods into five or six groups. The main food groups are grains, vegetables, fruits, and vegetables and fruits as a unified group. Some differences include the modality of food classification. Despite dietary pattern results from geographic conditions and cultural (ethnic) heritages, most nutritional key points are similar among the different European FBDGs: In particular, the basic message is to consume adequate amounts of grains, vegetables, and fruits with moderate intake of fats, sugars, meats, caloric beverages, and salt. Other healthy behaviors are frequently but not always indicated.
FBDGs still seem insufficient as far as ethnic peculiarities, agreement on how to group foods, and subgroup population nutritional requirements.
•Most nutritional key points are similar among the different European food-based dietary guidelines (FBDGs).•Healthy behaviors are frequently, but not always indicated.•FBDGs should be regularly revised.•FBDGs could improve prevention of noncommunicable diseases.
Journal Article