What is the impact of micronutrient deficiencies on macronutrient uptake?

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The discussion focuses on the impact of micronutrient deficiencies on macronutrient uptake, emphasizing that deficiencies can hinder the absorption and utilization of macronutrients such as fats, proteins, and carbohydrates. Specific examples include phytates found in raw legumes, which negatively affect nutrient bioavailability. Additionally, the role of gut bacteria, which account for approximately 2.2 kg of body weight, is highlighted as they influence nutrient uptake rates. The total energy intake from food is confirmed to be the sum of the caloric values calculated for each food item consumed.

PREREQUISITES
  • Understanding of macronutrients: fats, proteins, carbohydrates
  • Knowledge of micronutrients and their role in nutrition
  • Familiarity with bioavailability concepts in nutrition
  • Basic principles of calorimetry and energy calculations
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  • Research the effects of phytates on nutrient absorption in legumes
  • Explore the role of gut microbiota in nutrient metabolism
  • Learn about the relationship between micronutrient status and macronutrient utilization
  • Investigate calorimetry methods for measuring food energy content
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Nutritionists, dietitians, students in nutrition courses, and anyone interested in understanding the complex interactions between micronutrients and macronutrient uptake.

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I've read somewhere that 100 g of tomatoes have approximately 1 g protein, 2.6 g carbohydrates and 0.2 g fat. So it has 4*1 + 4*2.6 + 9*0.2 = 16.2 kcal

A fried egg (~50 g) has 89 kcal, 4 g protein, 0.4 g carbohydrates, 6.7 g fat. So it has 4*4+4*0.4+9*6.7 = 77.9 kcal

The sum of the kcals is 16.2 + 77.9 = 94.1 kcal
I have to write the total of the energy intake. Is it the same as the sum of the kcals, 94.1 kcal?
If not, then how can I calculate it?
 
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Yes. Energies can be added. :smile:

In fact you have used that twice already when adding up the contributions from the constituents...
 
In your example: total energy intake is the sum of the kcal calculation for each food item, summed over all food items.

If you are taking a nutrition course note:

1. Food antagonisms and environmental/genetic factors (bioavailability) reduce the uptake of macronutrients: fat, protein, carbohydrate content. Example: phytates in raw, or undercooked legumes.
This talks mainly about phytates and micronutrients. Micronutrient deficiencies can lead to reduced uptake/usage of macronutrients.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2266880/

2. 2.2kg of your body weight comes from gut bacteria. They consume food energy and alter uptake rates of some nutrients + or -.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3601187/

3. Not all of what you eat is "yours", so to speak.

FWIW - a lot of calorie data originated from data based on finding the heat of combustion of constituents of food items using a bomb calorimeter.
https://en.wikipedia.org/wiki/Calorimeter
 

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