No, we didn’t “hear that correctly”. That link is to a post by you where you mention your own opinions. No study I have found links any health problems to a Low-Carb diet.
http://www.annals.org/cgi/content/abstract/140/10/778
*and insulin sensitivity.
Results: By 1 year, mean (±SD) weight change for persons on the low-carbohydrate diet was –5.1 ± 8.7 kg compared with –3.1 ± 8.4 kg for persons on the conventional diet. Differences between groups were not significant (–1.9 kg [95% CI, –4.9 to 1.0 kg]; P = 0.20). For persons on the low-carbohydrate diet, triglyceride levels decreased more (P = 0.044) and high-density lipoprotein cholesterol levels decreased less (P = 0.025). As seen in the small group of persons with diabetes (n = 54) and after adjustment for covariates, hemoglobin A1c levels improved more for persons on the low-carbohydrate diet. These more favorable metabolic responses to a low-carbohydrate diet remained significant after adjustment for weight loss differences. Changes in other lipids or insulin sensitivity did not differ between groups.
Limitations: These findings are limited by a high dropout rate (34%) and by suboptimal dietary adherence of the enrolled persons.
Conclusion: Participants on a low-carbohydrate diet had more favorable overall outcomes at 1 year than did those on a conventional diet. Weight loss was similar between groups, but effects on atherogenic dyslipidemia and glycemic control were still more favorable with a low-carbohydrate diet after adjustment for differences in weight loss.
*"
http://linkinghub.elsevier.com/retrieve/pii/S0022347602402065
http://www.annals.org/cgi/content/summary/140/10/769
"*What are the implications of the study?
Low-carbohydrate diets seem to be effective and relatively safe. However, people on this diet must be monitored for harmful elevations of bad cholesterol."
*
*Conclusions There is insufficient evidence to make recommendations for or against the use of low-carbohydrate diets, particularly among participants older than age 50 years, for use longer than 90 days, or for diets of 20 g/d or less of carbohydrates. Among the published studies, participant weight loss while using low-carbohydrate diets was principally associated with decreased caloric intake and increased diet duration but not with reduced carbohydrate content.
*
http://jcem.endojournals.org/cgi/content/abstract/89/6/2717
These data suggest that energy restriction achieved by a very LC diet is equally effective as a LF diet strategy for weight loss and decreasing body fat in overweight and obese adults.
http://jama.highwire.org/cgi/content/abstract/293/1/43
Conclusions Each popular diet modestly reduced body weight and several cardiac risk factors at 1 year. Overall dietary adherence rates were low, although increased adherence was associated with greater weight loss and cardiac risk factor reductions for each diet group.
I could not find a single article in a legit medical journal that cited any sorts of special high risks for a Low-Carb diet.
My personal opinion- and yours- is worthless here. The cites speak for themselves.