According to the National Bureau of Statistics data, the cost of a healthy diet (CoHD) for September 2024 was N1,346 per adult per day, a 7.3% increase from N1,255 in August. The CoHD represents the most affordable mix of locally available foods that satisfy global dietary guidelines. It estimates that an adult would need to spend about N1,346 daily to maintain a nutritious diet. The increase indicates growing concerns about affordability as Nigerians face rising cost challenges while trying to maintain their dietary requirements amid inflationary pressures. Regional analysis revealed the South-West had the highest CoHD at N1,598 while the North-West had the lowest at N1,144. At the State level, Osun had the most expensive CoHD at N1,661, while Katsina had the least expensive CoHD at N1,043. The cost of a nutritious diet has increased more rapidly since July 2023, signalling pressure on items included in a healthy diet. The main factors contributing to the increase in CoHD are legumes, nuts, seeds, starchy staples, and animal-source foods, alongside issues in the supply chain, the cost of food production, and rising demand for nutritious food. Monitoring CoHD offers insights into inflation dynamics specific to essential food as high CoHD could guide interventions in nutrition. For example, improving supply chains for costly food groups or boosting agricultural production could reduce costs. These data-driven strategies could enhance food security and support access, especially in high-cost regions or food categories.