catecholamines adrenaline noradrenaline

Adrenaline is synonymous with epinephrine, and noradrenaline is synonymous with epinephrine. Noradrenaline is a precursor to adrenaline, as described here and here.

Diet composition and insulin

The composition of diet was found to influence the weight and concentration of catecholamines in the suprarenal (adrenal) glands. Compared to mixed diet controls (rats), a high-protein, lean-meat-only diet had no effect on the adrenal glands. A high-carbohydrate, rice-only diet reduced the absolute content of adrenaline the most. Starvation/fasting reduced adrenaline. A high-fat, lard-based diet decreased absolute adrenaline content more than starvation, but less than carbohydrate-only. Insulin itself may increase or decrease adrenaline content depending upon the amount of insulin.

I don't know whether a larger amount of stored adrenaline will in turn increase the rate of adrenaline/noradrenaline release in response to the same stimulus, but I'd speculate it would. We can probably say more adrenaline = more capacity to release adrenaline. Observations suggest that, when the adrenal glands are exhausted, mostly adrenaline is poured forth into the blood stream and relatively more noradrenaline is found in the gland.

Effect of low-carbohydrate-ketogenic diet on metabolic and hormonal responses to graded exercise in men
After 3 days on an approximately 50% fat : 50% protein ketogenic diet, it was concluded that (short-term) ketogenic diet does not impair aerobic exercise capacity. This may be due to increased utilization of beta-hydroxybutyrate and FFA when carbohydrate stores are diminished. Stimulation of the sympatho-adrenal system, and cortisol secretion with reduced plasma insulin concentration seem to be of importance for preservation of working capacity.

In an older man with lots of abdominal fat, after 17 days of Total Fasting norepinephrine (NE) and epinephrine (EPI) urinary levels showed a two-fold and nine-fold increase respectively, but they became undetectable at the end of TF. After 17 days of re-feeding catecholamine urinary levels were similar to those measured after 17 days of TF. A

Exercise

Catecholamine levels are increased from sustained exercise training.
Insulin turnover is decreased, from a diminished intensity of insulin output. The degree of responsiveness to catecholamines changes with sustained exercise training. Glucose elevation is increased, while FFAs and glycerol levels are reduced in response to noradrenaline (norepinephrine).
For adrenaline (epinephrine), long-term training enhances the lipolytic response to adrenaline; lipolytic action is enhanced by exercise. Keep in mind that levels of anything are also influenced by their clearance rate; their metabolism, utilization, or excretion. So decreased levels of FFAs probably indicates a higher rate of usage by (muscle) tissues.