What are the key takeaways from the opening speech of the "A Healthy Diet for a Healthy Life" conference, focusing on the main public health challenge and the role of the Joint Programming Initiative?

a) The speaker is delighted to have the honor of opening the international conference. b) The title of the conference is "A Healthy Diet for a Healthy Life". c) The diseases described as the greatest public health challenge of our time are overweight and obesity. d) The Joint Programming Initiative is important because it allows all member states to pool their knowledge together to tackle diet and lifestyle-related diseases, which makes sense both scientifically and economically. e) We are relying on science and innovation to help us tackle the new public health challenge of diet and lifestyle-related diseases.