1. A method of preventing, slowing down the development of symptoms or treating type 2 diabetes (whether or not associated with hypertension), comprising administering to a warm-blooded animal an effective amount of a renin inhibitor or a pharmaceutically acceptable salt thereof. ! 2. A method of preventing, slowing down the development of symptoms, or treating an increase in collagen and other extracellular matrix proteins, comprising administering to a warm-blooded animal an effective amount of a renin inhibitor or a pharmaceutically acceptable salt thereof. ! 3. A method of preventing, slowing down the development of symptoms, or treating coronary heart disease (CAD), comprising administering to a warm-blooded animal an effective amount of a renin inhibitor or a pharmaceutically acceptable salt thereof. ! 4. A method of preventing, slowing down the development of symptoms or treating kidney failure, glomerulonephritis, nephrotic syndrome, kidney fibrosis, acute interstitial nephritis (AIN), acute tubular nephritis (ATN), acute tubular interstitial nephritis, polycystic kidney disease (PKD), comprising the introduction to a warm-blooded animal an effective amount of a renin inhibitor or a pharmaceutically acceptable salt thereof. ! 5. The method according to claim 1, in which the renin inhibitor means a compound of formula (I)! ! or a pharmaceutically acceptable salt thereof. ! 6. The method according to claim 2, in which the renin inhibitor means a compound of formula (I)! ! or a pharmaceutically acceptable salt thereof. ! 7. The method according to claim 3, in which the renin inhibitor means a compound of formula (I)! ! or a pharmaceutically acceptable salt thereof. ! 8. The method according to claim 4, in which the renin inhibitor1. Способ профилактики, замедления развития симптомов или лечения диабета типа 2 (связанного или не связанного с гипертензией), предусматривающий введение теплокровному животному эффективного количества ингибитора ренина или его фармац