"Dehydration during fasting increases serum lipids and lipoproteins.

[..]The subjects fasted once with no fluid replacement and once with salt and water supplementation. Following both fasts, blood was drawn for lipid assessments. Compared to fasting with fluid and salt replacement, fasting with no fluids was associated with higher (mean, 95% confidence interval) total serum cholesterol (8.1%, 4.3-11.9%), HDL cholesterol (7.5%, 1.8-13.1%), LDL cholesterol (10.5%, 2.2-18.8%), apolipoprotein A-1 (8.9%, 5.0-12.8%), and apolipoprotein B (10.5%, 5.2-15.8%). The change in serum triglycerides was not statistically significant (12.4%,-0.5-25.3%).There was a greater reduction in body weight during fasting with fluid restriction compared to fasting with salt and water supplementation (1.8%, 1.3-2.2%). Fasting with fluid restriction results in significantly higher lipid levels and, therefore, variation in hydration of patients could contribute to fluctuation in lipid levels of patients. Care should be taken to ensure that patients are in a standard state of hydration during assessment of lipid levels. We recommend: 1) that patients fast no longer than 12 h, and 2) that, during fasting, patients avoid Iunnecessary physical activity, avoid hot dry environments, ensure a liberal intake of water, and avoid diuretic substances such as caffeine."

Now, as you may already know, high lipid levels are associated with higher chances of Cardiovascular disease and stroke. Therefore I wouldn't advise regular practise of dry fasting (instead water fasting may be much more efficient) and for this one I would suggest you stop the fast when your body is sending very crucial and dangerous messages like extreme thrist, pains originating from internal organs, significantly less frequency of urination, increased heart-rate, no weight loss for more than 1 day (secondary).

Good Luck.