Shan interviews Sam Feltham, founder and director of the Public Health Collaboration, a registered charity based in the UK since 2016. Sam talks about his journey from starting out as a fitness trainer, to his endeavours that led to creating the Public Health Collaboration. He also shares three of his experiences with different food types and how each of them demonstrated interesting and insightful results.   Self-experiments on diets, nutrition and exercise. In 2013, I was trying to think of a way on how to help people connect the dots of how a body expresses different foods. I decided to do some self-experiments to overeat twice as much as I usually would. I did it on three different diets, I did it for three weeks and I would have three months in between to biochemically reset.   First experiment was low carb real food diet. I ate almost 6,000 calories a day. Over those three weeks, after the protein thermogenic effect of food, loss of calories from fibre, and also any exercise I did, I ended up in a 47,000 calorie surplus. According to the calorie formula, I should have put on 6.1 kgs. But by the end, I had actually put on only 1.3 kgs. I lost 3 cms from my waist. That was an incredible and interesting finding. What is more interesting is the follow-up experiment.  Low-fat fake food diet. Three months after I biochemically reset I decided to do low-fat fake food. My calculator said it will be the same number of calories. I ended up in the same calorie surplus of 47,000 calories. I should have put on 6.1 kgs according to the calorie formula but in reality, I put on 7.1 kgs. I actually put on 9.3 cms around my waist. That was rather disconcerting. Those were two very interesting examples that you can have the same calorie surplus but two very different results depending on the type of food you eat. Very low-fat vegan diet. On that one, because I was eating 175 grams of fibre per day, I ended up with 40,000 calorie surplus. 7,000 calories less than my previous two experiments. According to the calorie formula, I should have put on 5.2 kgs but I ended up putting on 4.7 kgs. I put on 7.75 cms around my waist. The experiments were a powerful demonstration of the quality and types of food you eat can effect the body a lot more than the quantity.   Real Food Rocks. “This event will be running up in the Lake district on Saturday, the 20th of July. That will be organised by Dr. Jen Unwin. She is one of our scientific advisory board members. She's a clinical psychologist but newly retired. She offered to put this festival together. She has done an outstanding job. It is a family-friendly day that focuses on real food, real music and real fun. So if people want to check that out you can buy tickets on the website www.realfoodrocks.co.uk  Adult tickets are £10, child tickets are £5, and children that are five and under go for free.”  Real Food Day on the 19th of June, Wednesday. “It is an awareness day that is dedicated to highlighting the power of real food. I mean, really trying to demonstrate to the public that real food lifestyles have a huge impact on our daily lives. If you are living with diseases and conditions like Type II Diabetes, Obesity and conditions like that, it is possible to reverse those through a real food lifestyle. On the website, we have got lots of examples of real food stories of people.” Future of Public Health Collaboration. “One of our focuses at the moment is our Ambassadors Programme. That is a network of volunteers/representatives of PHC at the local level. Now we have about 150 ambassadors across the country. They have all gone through an interview process and training. They try to inform local health care professionals about the PHC, what we are trying to achieve, why we are doing it, how we can help them. One of the main ways we are trying to help them is by helping