What happens when a persons diet lacks the necessary enzymes for cellular respiration?

When a person's diet lacks the necessary enzymes for cellular respiration, the body struggles to effectively convert nutrients into energy. This can lead to decreased ATP production, resulting in fatigue, weakness, and impaired cellular functions. Without sufficient energy, essential biological processes, including metabolism and growth, may be negatively affected, potentially leading to various health issues over time. Additionally, the body may resort to alternative pathways for energy production, which can further disrupt metabolic balance.