Food And Nutrition

Concept: Certain fruits naturally contain compounds that can have toxic or pharmacological effects. In citrus fruits like grapefruit, specific compounds can interfere with human metabolism.
Step 1: Understanding the toxin.
Furanocoumarins are naturally occurring chemical compounds found in grapefruit and some other citrus fruits.
Step 2: Effect on the body.
These compounds inhibit enzymes (especially CYP3A4) involved in drug metabolism, which can lead to increased concentration of certain medications in the bloodstream.
Step 3: Eliminating other options.

• Solanine: Found in potatoes
• Cyanogenic glycosides: Found in cassava and some seeds
• Aflatoxins: Produced by fungi in contaminated grains

Step 4: Conclusion.
Thus, the natural toxin found in grapefruit is furanocoumarins.