Frequent urination at night is common especially in elderly diabetics and people with diabetes for 10 years. This is due to the decrease of kidney function especially the tubular function decrease. Healthy tubules can reabsorb the electrolytes, protein and most fluid, as well as regulate urine PH. When the tubule is damaged, the concentration function decreases, leading to low osmotic pressure.

Fastin involves the use of nutrient-complete formula total food replacement products, developed in Britain by qualified nutritionists and experts in weight .