Danny Lennon


  • Master of Science in Nutritional Sciences (University College Cork)
  • Master Thesis: Modelling Vitamin D Status with Interventions (under Professor Kevin Cashman)
  • Bachelor of Science in Biological Sciences & Physics (University of Limerick)
  • Bachelor Thesis: Optimal Arousal Levels for Athletic Performance

Professional Activity

  • Speaker at multiple international conferences and summits
  • Founder of Sigma Nutrition & Performance
  • Host of the top-ranked podcast Sigma Nutrition Radio
  • Performance nutritionist to elite powerlifters (including Brett Gibbs) and several professional MMA athletes and professional boxers.
  • Creator of the Sigma Weight Cutting System
  • Experienced speaker & presenter

Code of Practice

  • Former Brazilian Jiu-Jitsu competitor (blue belt)
  • Currently competing in the IPF-affiliated Irish Powerlifting Federation (-74kg class)