Q. How could one boost metabolism by diet? I am aware for long that metabolism is the cause for poor health and how could one boost metabolism by diet? A. Metabolism, if it is not erroneous genetically; then it can be controlled or increased by any diet. What matters is the timing and regularity you feed yourself which uses your hormones and enzymes in your body to do the task they are for. This timing and regularity depends on eating in same time regularly and working and sleeping too. To excite some hormones even if they had switched off their action in body, can be excited by exercise and feeding with small diets in regular short time intervals. To make all this happen, reduce on junk foods, please.
There are, however, some foods where the caloric expenditure to process them is a little higher than the calories they provide the system. The clear example is water, especially ice-cold water. The body needs to warm it up before absorbing it, leading to a small caloric debt. Foods with very high water content, such as celery, also have this tiny catabolic effect. But the nutritional value of water and celery are not high enough to properly sustain an organism, so relying solely on these foods to lose weight can lead to serious health complications.