Final answer:
Natural defences can be boosted to combat HD through regular exercise, a healthy diet, and stress reduction techniques.
Step-by-step explanation:
Natural defences can be boosted to combat HD, or Huntington's disease, through various lifestyle choices and interventions. One way to boost natural defences is through regular exercise, which has been shown to have a positive impact on the immune system. Eating a healthy diet rich in fruits, vegetables, and nutrients can also support the body's natural defences. Engaging in stress-reducing activities like meditation or practicing good sleep hygiene can help alleviate stress and boost the immune system as well.