Intensifying sensations during meditation after switching to an Ayuverdic lifestyle I've been a Vipassana meditator for some time (2 10-day retreats and regular meditation on a near-daily basis). I've found it tremendously helpful and life changing. I'm also a type-1 diabetic.

I sought the advice of a good Ayuverda doctor near me and started following his guidelines for what to eat/not to in accordance with my "prakriti". 

I eat mostly vegetables and rarely ever touch meat. I've been eating very healthy and have noticed a lot of improvements in overall wellbeing. 

However, I have been experiencing some bizarre things in my meditation. Extremely intense emotions and sensations began to arise in my body and it makes me wonder if a cleaner diet had anything to do with it. I feel a constant clenching and tightness in my whole neck which goes up to the left side of my head up the jaw. I feel much more from the left side of my chest. Various sensations have begun to arise from there and it makes me wonder if this is a natural evolution when one goes along the path.

I am constantly in touch with my healthcare team and have a clean bill of health even after many years with diabetes. I feel much more in my body, but cannot describe it to my doctors as i feel this has something to do with my awarenss gained from meditation. Unfortunately, I use cannabis (trying to quit) and feel that the cannabis greatly intensifies very unpleasant sensations, particularly in the chest area where I even feel some stabbing pain and burning. 

Does eating vegetables increase the "sharpness" of meditation? Should I quit drinking coffee/using cannabis? I am intrigued by what is happening in my body and have no clue which person I should consult about these sort of things. I am a vata/pitta individual living in the Netherlands.
First, good to hear that you have your health in check thanks to the medical care you mention. With their attention, we could likely rule out the medical aspect of your sensations. However, i can't tell from your description if they have been consulted about the tightness in the neck and head you describe.


  Does eating vegetables increase the "sharpness" of meditation? 


It's more likely that eating vegetables keeps you from being dull or drowsy, by staying away from food that requires a lot of energy to digest. In fact, the sixth buddhist precept has this particular purpose.


  Should I quit drinking coffee/using cannabis? 


According to buddhism, substances keeps us in an unbalanced way of life due to craving (tanha). If you manage to reduce your craving habits it will help you develop better karma for yourself, in turn helping calm and concentration in accordance with the fifth buddhist precept.

This goes primarily for cannabis, as it is altering your perception/concentration, but also to a lesser extent coffee, since caffeine can prevent you from developing samatha or tranquility during meditation.


  I am intrigued by what is happening in my body and have no clue which person I should consult about these sort of things. I am a vata/pitta individual living in the Netherlands. 


The experiences you have are addressed in many different traditions of thought. Buddhism very much provides a framework for understanding and dealing with your questions, but may/may not correspond to ayurvedic practice (i know practically nothing about those things). 

Put shortly, what you are experiencing could be considered citta sankhara, or formations of perception as a result of your habits, generally speaking. Provided it's not a medical cause for your sensations, they will probably be stilled if you continue your meditation practice.