Insights in Nutrition and Metabolism

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Opinion Article - Insights in Nutrition and Metabolism (2024) Volume 8, Issue 2

From nutrients to cells: The journey of food in the body

Connie Roche *

School of Human Movement and Nutrition Science, The University of Queensland, Australia

*Corresponding Author:
Connie Roche
School of Human Movement and Nutrition Science, The University of Queensland, Australia

Received: 01-Mar-2024, Manuscript No. AAINM-24-133213; Editor assigned: 02-Mar-2024, PreQC No AAINM-24-133213 (PQ) Reviewed:16-Mar-2024, QC No. AAINM-24-133213 Revised:22-Mar-2024, Manuscript No. AAINM-24-133213 (R); Published:26-Mar-2024, DOI:10.35841/aainm-8.2.194

Citation: Roche C. From nutrients to cells: The journey of food in the body. Insights Nutr Metab. 2024;8(2):194

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The journey of food through the human body is a remarkable process that begins with the simple act of eating. From the moment food enters our mouths, it embarks on a complex journey that ultimately fuels our cells, sustains our energy, and nourishes our entire being. Understanding this journey, from the breakdown of nutrients to their absorption into cells, unveils the intricate mechanisms that sustain life [1].

Digestion, the initial stage of this journey, commences in the mouth as enzymes in saliva start breaking down carbohydrates. As we chew, food mixes with saliva, forming a bolus that travels down the esophagus and into the stomach. Here, gastric juices containing enzymes and acids further break down the food into smaller molecules [2].

The small intestine, a crucial site for nutrient absorption, is where the real magic happens. Enzymes from the pancreas and bile from the liver aid in the breakdown of proteins, fats, and carbohydrates into their constituent molecules—amino acids, fatty acids, and sugars, respectively. These molecules are then absorbed through the intestinal lining into the bloodstream [3].

Once absorbed, these nutrients become the body's building blocks and energy sources. Amino acids are utilized for protein synthesis, crucial for muscle repair and growth. Fatty acids contribute to cell membrane structure and serve as precursors for hormones. Sugars, particularly glucose, are the primary fuel for cellular energy production [4].

But the journey doesn't end there. Nutrients must be transported to cells throughout the body to fulfill their diverse functions. This task falls to the circulatory system, specifically the bloodstream. Nutrients hitch a ride on red blood cells and plasma, circulating to tissues and organs where they are needed [5].

At the cellular level, nutrients are taken up through cell membranes via various transport mechanisms. Each cell selectively absorbs the nutrients required for its specific function. For instance, muscle cells eagerly take in amino acids for repair and growth, while neurons prioritize glucose for energy [6].

Within cells, the journey of nutrients continues as they undergo various metabolic processes. Glucose, for example, undergoes glycolysis, a series of reactions that produce ATP—the cell's energy currency. Fatty acids are broken down through beta-oxidation to generate ATP as well [7].

Meanwhile, amino acids are utilized not only for protein synthesis but also for energy production if needed. Excess amino acids may be converted into glucose or stored as fat. Each nutrient plays a unique role in cellular metabolism, ensuring the proper functioning of the body's myriad processes [8].

However, not all nutrients are created equal, and their journey through the body can be influenced by factors such as diet, metabolism, and health status. Poor dietary choices can hinder nutrient absorption and utilization, leading to deficiencies and health complications [9].

Moreover, certain medical conditions can disrupt the journey of nutrients in the body. Conditions like malabsorption syndromes impair nutrient absorption in the intestines, while metabolic disorders affect nutrient metabolism within cells. Understanding these complexities is crucial for managing and treating such conditions effectively [10].


In essence, the journey of food from nutrients to cells is a marvel of biological engineering. It underscores the interconnectedness of our bodily systems and highlights the importance of a balanced diet for optimal health. By appreciating this journey, we gain insight into the profound impact of nutrition on our well-being, empowering us to make informed choices that support our bodies every step of the way.


  1. Nichter M, Thompson JJ. For my wellness, not just my illness: North Americans’ use of dietary supplements. Cult Med Psychiatry. 2006;30:175-222.
  2. Indexed at, Google Scholar, Cross Ref

  3. Kapoor N, Jamwal VL, Shukla MR, et al.,. The rise of nutraceuticals: overview and future. Biotechnology Business-Concept to Delivery. 2020:67-92.
  4. Indexed at, Google Scholar, Cross Ref

  5. Ghosh D, Smarta RB. Pharmaceuticals to nutraceuticals: A shift in disease prevention. CRC press; 2016.
  6. Indexed at, Google Scholar, Cross Ref

  7. Sharif MK, Khalid R. Nutraceuticals: Myths versus realities. Academic Press.
  8. Indexed at, Google Scholar, Cross Ref

  9. Dureja H, Kaushik D, Kumar V. Developments in nutraceuticals. Indian J Pharmacol. 2003;35(6):363-72.
  10. Indexed at, Google Scholar

  11. Zeisel SH. Regulation of  nutraceuticals. Science. 1999;285(5435):1853-5.
  12. Indexed at, Google Scholar

  13. Rajat S, Manisha S, Robin S, et al.,. Nutraceuticals: A review. Int Res Pharm. 2012;3(4):95-9.
  14. Indexed at, Google Scholar

  15. Frisvold MH. Functional Foods and nutraceuticals. Complementary Therapies in Nursing: Promoting Integrative Care. 2022:394.
  16. Indexed at, Google Scholar

  17. Basak S, Gokhale J. Immunity boosting nutraceuticals: Current trends and challenges.  J food biochem. 2022;46(3):e13902.
  18. Indexed at, Google Scholar, Cross Ref

  19. Sachdeva V, Roy A, Bharadvaja N. Current prospects of nutraceuticals: A review  Curr Pharm Biotechnol. 2020;21(10):884-96.
  20. Indexed at, Google Scholar, Cross Ref

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