What is Nutrition: Definition and 27 Discussions

Nutrition is the biochemical and physiological process by which an organism uses food to support its life. It includes ingestion, absorption, assimilation, biosynthesis, catabolism and excretion.The science that studies the physiological process of nutrition is called nutritional science (also nutrition science).

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  1. Algr

    Can you eat the Periodic Table?

    If you had an unlimited supply of periodic elements (in their most stable form), an advanced lab, and internet access, but could not access things like seeds or actual samples of DNA, could you make food? I know salt and water would be easy to make. But what about sugar, proten, and vitamins...
  2. jim mcnamara

    More on nutrition research issues

    "The characteristics and extent of food industry involvement in peer-reviewed research articles from 10 leading nutrition-related journals in 2018" G Sachs et al. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0243144#sec012 Popular science version...
  3. jim mcnamara

    Food labels and nutrition references

    US References: https://ods.od.nih.gov/HealthInformation/Dietary_Reference_Intakes.aspx DRI provides basic nutritional intake guidelines. There are extensive tables broken out by nutrient, by age and by gender. Terminology: USDA Food data central (FDC) https://fdc.nal.usda.gov/ The EU...
  4. kyphysics

    Does Lactose Intolerance Mean I Cannot Absorb Nutrition from Milk?

    I know that being intolerant makes it so that my stomach doesn't digest milk/dairy products very well. I get gas and diarrhea at times. But, would it also mean that when I eat something with dairy that my body does not digest the nutrition in it (as it may be "kicking" it out of my body...or...
  5. nomadreid

    Nutrition and Cancer: Finding Evidence of Direct Benefits

    Using the keywords "nutrition" and "cancer", the Internet spews out thousands of articles. Ignoring the supermarket-checkout-magazine type of article, the others tend to either (a) be debunking various myths or (b) advising to avoid carcinogenic substances or (c) recommending to have a healthy...
  6. T

    Medical Ultra-processed Food = Greater Cancer Risk

    Just out in the British Medical journal. http://www.bmj.com/content/360/bmj.k322 or permalink doi: https://doi.org/10.1136/bmj.k322 And here is a link to the NOVA classification of "Ultra-processed" food...
  7. F

    Perfect food with no need for excretion?

    Perfect Food : Is it possible to design our daily food/meals in such a way that it has all the nutrients (100% absorb-able) but no waste parts, thus removing the necessity for the body to excrete anything at all? (This will reduce the food quantity making it cheaper; I understand that fiber...
  8. .Scott

    Is Sugar's Metabolism Linked to Depression Risk in Men?

    According to this study: https://www.nature.com/articles/s41598-017-05649-7 What I find interesting is that the authors did not list the byproducts produced when fructose is metabolized as a possible vehicle for what they found. In fact, in one news article a scientist commenting on the study...
  9. M

    Non-caloric essential nutrients big vs small animals

    It is true that big animals contain more calories than small animals. However, are the figures for the content of essential nutrients that are not calories different? Such nutrients may be limiting factors and require foraging strategies that would be suboptimal from a simple calory point of...
  10. G

    Diet consisting of only a few types of foods

    Thinking of starting keto, and thought it would be fun to try and live off of coconut milk, low carbohydrate bread, butter, and some kind of meat or fish for dinner. Provided I take a multivitamin, along with calcium and magnesium pills, would this diet be as healthy as any other? Could I be...
  11. 5P@N

    Is a joule also known in nutrition as a kilojoule?

    I just came across Table 2 on pg 173 of...
  12. J

    Hair & Nutrition: Retaining More Nutrition with More or Less Hair?

    When would I retain more nutrition in my body - when I have more hair or less hair?
  13. Suraj M

    Ecoli Nutrition: Does It Only Feed on Lactose?

    This might be a stupid question,but does E Coli obtain energy only by using up lactose, or other sugars too? I want to know because if Lactose is the only sugar it feeds on, then a lactose intolerant person would not have E Coli in his colon(intestine)?
  14. C

    Molecular nutrition- health and desease- any good books?

    Hi, I'm very interested in understanding how molecules in nutrition play a role in sustaining the human body so I'm looking for some good chemistry/molecular nutrition book describing some of the following: *The chemical and metabolic pathways taking place in the body (such as glykolysis...
  15. P

    Anyone pretty into exercise and nutrition?

    By that I mean, are there any weight-lifters on PF? Women/men, squats/curls, anyone pretty into exercise and nutrition?
  16. N

    Dieting, Nutrition and the Scientific Method

    The Better Half is always researching the latest diet trends, theories, observations, etc... I check out the articles every now and then and it seems like the overlaying problem with all these studies is the removal of variables in a study. Is it possible to accurately measure/test nutrition...
  17. 1

    Medical Poor nutrition leading to overeating?

    A friend of mine is quite taken with the idea that the lack of nutrition in typically consumed food is causing our bodies to crave more food (to make up the missing nutrients), leading to overeating and obesity. I'm quite sceptical of this supposed link but I'd love to hear the opinions of...
  18. Pengwuino

    Medical Nutrition label stuffs and diets

    I HAS QUESTION! :D I've always heard that when you're an athlete or someone who does a lot of exercising, it's important to eat foods that are high in carbohydrates. I hear that it's because the body is capable of converting carbohydrates into useable energy quicker than it can fat (is this...
  19. B

    Medical Nutrition: Is Freshness Worth the Price Difference?

    Hi, All: This is my 1st post to Biology; I hope this is not too far off : There are two main brands of juice drinks I often drink, say, A and B. A is 33% more exprensive than B, but the only difference I could find between them is that A contains a combination of 3-4 juices, all of...
  20. Greg Bernhardt

    Medical Gerson Method and Nutrition Therapy (FoodMatters)

    I've been watching the documentary https://www.amazon.com/dp/B001B3XZAW/?tag=pfamazon01-20. It seems like quackery to me! It makes the very suspicious claim that eating a proper diet will not only prevent all illness but can cure all current illness. A proper diet is defined as: raw, organic...
  21. J

    Nutrition Tablets: Can We Replace Food?

    Why can't we replace food with equivalent nutrition tablets, and/or injection?
  22. L

    Heating & Nutrition: Sweet Potato's Effects

    When I heat up, for example, a sweet potato in the microwave, how is the heating process affecting the nutritional aspects of the sweet potato? Heat affects enzymes, proteins, vitamins and whatever else. Does the heat render them useless? I heard vitamin C is destroyed in the pasteurization...
  23. F

    Medical Question about Nutrition and Brain Development

    Hey, I just had a quick question. If I was wasn't given the proper nutrition when I was grown up like most people (I'm 19 now), does that mean that if I was given the proper nutrition that I'd be smarter than I am right now? Would this lack of nutrition cause make brain to develop more slowly...
  24. F

    Medical Well-researched nutrition information

    I started working out again after a long break, and my muscle fatigue is lasting for days, really destroying my motivation to stick to my schedule. I was just wondering if anyone knew of any legitimate, well-researched nutrition information, supplements, or techniques that I should know of to...
  25. E

    Nutrition Thread: Discussion & Resources

    I am starting this in analogy with "the Food Thread". The point of this is to thread is to house people's comments and to collect their resources and to foster discussion about the highly important and relevant-to-our-daily-lives topic of human nutrition. I want people to post here particularly...
  26. T

    Peanut Butter & Bread: Is It Enough For Long-Term Nutrition?

    Is it possible to eat only peanut butter for months on end and be relativelly healthy?Or maybe bread and water can do the trick?
  27. Monique

    Nutrition and energy requirement

    I was trying to find out what the energy requirement of an adult male or female would be in kJ or in kcal, but I can't seem to find it. Nautica must know :) Which are some good resources which list energy content of foods (except the label on it :P)?
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