Good food and vitamin stores is a long term thing. You must eat well enough to replenish what vitamins and minerals you use up and keep everything topped off. I would say it takes at least 2-3 months to really see any improvements from an improved diet and they are not so easy to detect. You may notice one day that you are not as tired as normal, or that you are sleeping better because of the improved eating. You won't get a kick and all of the sudden feel extra strong and good.