Food and drugs interactions may instinctively increase or decrease the effect of drugs. The potential of food and diet ingredients that affect the health is known in the last few years. Consumption of food now not only helps to reduce the hunger but is also involved in numerous health issues, so fluctuating with consumption of pharmaceutical products. This curiosity in the well-being and health sector forces the sales of market foods as functional and health foods. The active components of food products, which affect human health are bioactive compounds. These mentioned products are mainly classified as foodstuffs, but consumers are increasingly drawn to items at the connections of nutrition and pharmaceuticals. A wide range of dietary compounds is found to interact with protein biomolecules involved in drug pharmacokinetics and affecting the process from oral bioavailability and intestinal transport to metabolism, blood circulation, and systemic distribution. Some clinically important food–drug interactions result from food-induced alterations in drug bioavailability. Clinically important food–drug relations that cause likely damages to the patient, may be due to alterations in pharmaceutical properties. Food–drug interactions reduce the effectiveness and may cause toxicity and also sometime reduce bioavailability and alter clearance processes. Food and drugs both are very essential for life but their interactions can cause side effects so very careful identification is needed.