According to the available food security statistics, it is shown that food insecurity is prevalent in Nigeria and putting in view the rising world population, this food insecurity is a phenomenon that threatens the world at large. Therefore, the examination of the effect of population dynamics on food availability as a measure of food security in Nigeria is the purpose of this paper. My datasets were gotten from the World Development Index (WDI) for the year 2021, from which data relevant to my work from the year 2001 to 2020 were extracted for analysis. The independent variables were Dependent population, Birth Rate and Death Rate while the dependent variable Food Security is represented by Food Availability. A descriptive analysis was done to get the nature of my datasets after which a stationarity test was ran. An ARDL test was used to analyse the data after the optimal lag length criteria had been determined. Also, a bound test was carried out to determine the relationship between the variables in the long-run. The ARDL result showed that an indirect relationship between the dependent variable (FA) and independent variables BR and DR was observed and LNDEP had a positive relationship with the dependent variable. The R-Squared gotten was 0.99 and there exists a long-run relationship between all variables according to the Bound test. The recommendation of the study, based on this finding, is that a system that puts a check on birth rate and encourages the youths and young adults to participate in agriculture should be put in place.