Protein Intake of Vegetarians and Non-vegetarians in Port Harcourt, Rivers State, Nigeria

Main Article Content

C. A. Orisa
C. I. Usoroh


Objective: The purpose of this study was to investigate the protein intake of vegetarians and non-vegetarians in Port Harcourt, Rivers State.

Methodology: Four objectives and four research questions guided the study. A survey research design was adopted for the study. A sample size of 400 respondents was selected using Taro Yamene formula and purposive sampling techniques. The instrument used for data collection was a questionnaire tagged: Protein Intake of Vegetarians and Non-Vegetarians in Port Harcourt Questionnaire (CPIBVNVQ). The instrument was validated by three experts with a reliability coefficient of 0.56. Data obtained were analyzed using descriptive statistics (frequency, percentage) and findings were presented on tables.

Results: Prevalence of vegetarianism was high in females (53%) than in males (47%). Protein intake by the vegetarians was high (97%) when compared with vegetarians who do not eat proteinous foods (3%). Among the non-vegetarians, 94% eat proteinous foods while 6% do not eat. The study also showed that protein intake is better in non-vegetarians than vegetarians. Higher percentages of non-vegetarians (84.3%) fell sick and got diagnosed of ailments as compared with 17.4% for vegetarians suggesting that the vegetarians experience enhanced immune function. Reduced saturated fat and blood cholesterol was a tool that influenced the respondents in choosing the vegetarian lifestyle with 82.5% for vegetarian and 13.8% for non-vegetarian.

Conclusion: Based on the findings, it was recommended that vegetarians should be encouraged to consume more plant proteins especially soy based foods since they are high biological value protein food comparable to animal products.

Vegetarians, non-vegetarians, proteins, diet, eating pattern.

Article Details

How to Cite
Orisa, C. A., & Usoroh, C. I. (2020). Protein Intake of Vegetarians and Non-vegetarians in Port Harcourt, Rivers State, Nigeria. European Journal of Nutrition & Food Safety, 12(8), 33-44.
Original Research Article


William M, Paul FP. The structure and function of skin. 3rd ed. Academic press incorporated, Beaverton: Oregon; 2012.

Winston JC, Ann RM. Position of the American Dietetic Association:Vegetarian diets. Journal of American Dietetic Association. 2009;109:1266-1282.

Brzezińska M, Kucharska A, Sińska B. Vegetarian diets in the nutrition of pregnant and breastfeeding women. Journal of American Dietetic Association. 2016; 40(238):264-278.

Mangels R, Messina V, Messina M. The Dietitian’s Guide to Vegetarian Diets, 3rd ed. Sudbury, MA: Jones and Bartlett Learning; 2011.

Craig WJ, Mangels AR. Position of the American Dietetic Association: Vegetarian diets. Journal of American Dietetic Association. 2009;109:1266-1282.

Swinburn BA, Sacks G, Lo SK, Westerterp KR, Rush EC, Rosenbaum M, Luke A,Schoeller DA, DeLany JP, Butte NF, Ravussin E. Estimating the changes in energy flux that characterize the rise in obesity prevalence. American Journal of Clinical Nutrition. 2009;89:1723-1728.

Shridhar K, Dhillon PK, Bowen L, Kinra S, Bharathi AV, Prabhakaran D. The Association between a Vegetarian Diet and Cardiovascular Disease (CVD) risk factors in india: The indian migration study. PLoSOne. 2014;9(10):e110586.

DOI: 10.1371/journal.pone.0110586

Tripkovic L, Lambert H, Hart K, Smith CP, Bucca G, Penson S, Chope G,Hyppönen E. Comparison of vitamin D2 and vitamin D3 supplementation in raising serum 25-hydroxyvitamin D status: A systematic review and meta-analysis. American Journal of Clinical Nutrition. 2012;95(6): 1357-1364.

Monica D, Rosanna A, Gian FG, Alessandro C, Francesco S. Vegetarian, vegan diets and multiple health outcomes: A systematic review with meta- analysis of observational studies. Critical Reviews in Food Science and Nutrition. 2016;58(7): 1–9.

MaeveH, Maria H, Anne-Maria M, Mark F, Brijesh T. Future protein supply and demand: Strategies and factors influencing a sustainable equilibrium. Journal of Pubmed Central. 2017;6(7):58–69.

Cavazos A, Gonzalez de Mejia E. Identification of bioactive peptides from cereal storage proteins and their potential role in prevention of chronic diseases. Comprehensive Reviews in Food Science and Food Safety. 2013;12:364–380.

Rodriguez NR, DiMarco NM, Langley S. Position of the American Dietetic Association, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and athletic performance. Journal of American Dietetic Association. 2009; 109:509-527.

Khan N, Afaq F, Mukhtar H. Cancer chemoprevention through dietary antioxidants: Progress and promise. Antioxidant and Redox Signaling. 2008; 10:475-510.

Ekeinde A. Slum demolition plan ups tension in Nigeria oil hub. Reuters Africa. 2010;2.

Retrieved 28 April, 2018

The Tide Newspaper. Medical Tourism: The Rivers Initiative. Port Harcourt: Rivers State Newspaper Corporation, February; 2014.

Retrieved 28 April, 2018.

Demographia. Demographia World Urban Areas. (11th ed.), February; 2014.

Retrieved 28 April, 2018.

World Population Prospects. - United Nations population estimates and projections.Department of economic and social affairs of the United Nations secretariat; 2014.

Ihejirika WC. Muslim minorities and media access in a predominantly Christian city: The case of Port Harcourt, Nigeria. In Winston Mano. Journal of African Media Studies and Intellect. 2009;469–491.

Bazzano LA, Li TY, Joshipura KJ, Hu FB. Intake of fruit, vegetables, and fruit juices and risk of diabetes in women. Diabetes Care. 2008;31:1311-1317.

Altorf-van der C, Kuil W, Engberink MF, Vedder MM. Sources of dietaryprotein in relation to blood pressure in a general Dutch population. PLoSOne. 2012;7: e30582.

Ruby M. Vegetarianism. A blossoming field of study. Appetite. 2012;58(1):141-150.

Kumar S, Syed A, Mohammed J, Shanawaz C, Mamum AD. Nutrition in lipidprofile in general population and vegetarian individuals living in Rural Bangladesh. Journal Obesity and Weight loss Therapy. 2012;55:123-138.

Marsh K, Zeuschner C, Saunders A. Health implications of a vegetarian diet. American Journal Lifestyle Medication. 2011;1(10):1177.

Belasco W. Food: The key concepts. Oxford University Press; 2008.

Leitzmann C. Vegetarian nutrition: Past, present, future. American Journal Clinical Nutrition. 2014;100:496–502.

Nivedita S, Singh SP, Raizada A. A comparative study on parameters of lipid metabolism and fasting blood sugar in normal vegetarians and non–vegetarians. Journal of Advanced Research in Biological Sciences. 2012;4(4):306–311.

Sluijs I, Joline WJB, Vander DL, Spijkermen AMW, Grobbee DE, Schouw YTV. Dietary inake of total, animal, and vegetable protein and risk of type 2 diabetes in the European prospective investigation (EPIC)-NL study. Diabetes Care. 2010;33(1):43-48.

Garcia AL, Koebnick C, Dagnellie PC, Leitzmann C, Hoffmann I. Long term strict raw food diet is associated with favourable plasma beta- carotene and low plasma lycopene concentrations in Germans. British Journal of Nutrition. 2008;99:1293-1300.

Xiao CW. Health effects of soy protein and isoflavones in humans. The Journal of Nutrition. 2008;138(6):1244-1249.


Halkjær J, Olsen A, Overvad K, Jakobsen MU, Boeing H, Buijsse B, Palli D, Tognon G, Du H, Vander ADL, Forouhi NG, Wareham NJ, Feskens EJ, Sorensen TI, Tjonnel A. Intake of total, animal and plantprotein and subsequent changes in weight or waist circumference in European men and women: The Diogenes project. International Journal of Obesity (London). 2011;35:1104-1113.

Fraser GE. Vegetarian diets. What do we know of their effect on common chronic disease? American Journal of Clinical Nutrition. 2009;89:16075–16125.

Anderson JW. Beneficial effects of soy protein consumption for renalfunction. Asia Pacific Journal of Clinical Nutrition. 2008; 17(1):324-328.

Dagnelie PC, Mariotti F. Vegetarian diets: Definitions and pitfalls in interpreting literature on health effects of vegetarianism. Vegetarian and Plant-Bsed Diets in Health and Disease Prevention. 2017;3-10.

Gili RV, Leeson S, Montes-Chani EM, Xutuc D, Contreras-Guillen IA, Guerrero-Flores GN, Martins MCT, Pacheco FJ, Pacheco SOS. Healthy lifestyle practices among Argentinan vegetarians and non-vegetarians. Nutrients. 2019;11:154.

DOI: 10.3390/nu11010154

Olapade AA, Aworh OC, Oluwole OB. Quality attributes of biscuit from Acha (Digitaria exilis) flour supplemented with cowpea (Vigna unguiculata) Flour. African Journal of Food Science and Technology. 2011;2(9):198–203.

ADA. Position of the American Dietetic Association and Dieticians of Canada: Vegetarian diets. Journal of the American Dietetic Association. 2009;103(6):748-765.

Check J, Schutt RK. Research methods in education. Thousand oaks, CA: Sage. 2012;160.

Nieman, DC. Nutrition and the immune system. Tratto da vegetarian Nutrition and Health Letter. pubblicatodalla Loma Linda University (Traduzione in italiano). 2000; 3(1).

Yokoyama Y, Nishimura K, Barnard ND. Vegetarian diets and blood pressure: A meta-analysis. JAMA Internal Medicine. 2014;174:577-587.

Mann N, Pirotta Y, O’Connell S, Li D, Kelly F. Fatty acid composition of habitual omnivore and vegetarian diets. 2006;637-646.

Lobo V, Patil A, Phatak A, Chandra N. Free radicals, antioxidants and functional foods: Impact on human health. Pharmacognosy Reviews. 2010;4(8):118-126.

DOI: 10.4103/0973-7847.70902