The answer is false... When you have a balanced diet and drink plenty of fluids, there is no need to take the supplements. Your body has developed a system in order to be healthy.
Dietary Supplements are capsules or tablets that contain vitamins, minerals, and other necessary substances for the body that can also be found in food. Due to this, dietary supplements are recommended in the case of deficiency and during some stages of life such as childhood or during pregnancy. However, if you have a healthy and well-balanced diet you will obtain all the substances you need from food and therefore it is not necessary to take supplements.
According to this, it is false Thomas should take supplements to account for all the calories he loses while running because supplements do not provide calories but minerals and vitamins and also if he has a well-balanced diet he does not need supplements.
