What is the impact of micronutrient deficiencies on macronutrient uptake?

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In summary, the conversation discusses the calculation of energy intake based on the macronutrient content of various food items. It is mentioned that 100g of tomatoes have 16.2 kcal and a fried egg (~50g) has 77.9 kcal, bringing the total energy intake to 94.1 kcal. It is also noted that food antagonisms and environmental/genetic factors can affect the uptake of macronutrients, and that gut bacteria can also alter the uptake rates of nutrients. Furthermore, it is mentioned that not all of the food we eat is directly used by our bodies. Overall, the concept of energy intake is based on the heat of combustion of food items, calculated using a bomb calorimeter.
  • #1
Physicsrapper
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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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  • #2
Yes. Energies can be added. :smile:

In fact you have used that twice already when adding up the contributions from the constituents...
 
  • #3
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
 

FAQ: What is the impact of micronutrient deficiencies on macronutrient uptake?

What is energy intake?

Energy intake refers to the amount of energy, measured in calories or joules, that is consumed through food and drink in a given time period. It is a crucial factor in maintaining a healthy weight and meeting daily energy requirements.

How is energy intake calculated?

To calculate energy intake, you need to know the calorie content of the foods and drinks consumed. This can be obtained from nutrition labels or online databases. Then, simply add up the calories from all sources to get the total energy intake.

What factors can affect energy intake?

Several factors can influence energy intake, including age, gender, body size, physical activity level, and metabolism. Genetics, hormones, and psychological factors such as stress and emotions can also play a role.

Why is it important to calculate energy intake?

Calculating energy intake is important because it allows individuals to monitor and adjust their calorie intake to meet their energy needs. It can also help identify patterns of overeating or undereating, which can have negative effects on health and weight management.

How can I calculate my recommended energy intake?

Your recommended energy intake depends on various factors such as age, gender, body composition, and activity level. You can consult with a registered dietitian or use online calculators to estimate your daily energy requirements based on these factors.

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