Depends on your viewpoint. As another person who knows nothing about Natural Hygiene, you make the mistake of assuming that everyone practiced NH before modern medicine came along. The American Indians actually used herbal medicine and many thought that disease was caused by witches. There's no evidence so far that they knew anything about food combining or the correct use of the fast.
Why were they a declining civilisation? Good question but unfortunately they weren't so good at documenting their decline as we are.
What "stats" are you talking about and what "natural" civilization, specifically, are you comparing them to?
Here's a few:
Source: Summary Health Statistics for U.S. Adults: National Health Interview Survey, 2010,
http://www.cdc.gov/nchs/data/series/sr_10/sr10_252.pdf
Persons diagnosed with Heart Disease (All and Hypertension subset)
(These are only the stats of living people who replied to the survey. None of this reflects the people who had died of any of these complaints)
Code:
Any
Sample Heart Hyper- Cancer Diabetes Arthritis
size Disease tension (Any)
18-44 years 110,615 4.4% 9.3% 2.2% 2.8% 7.1%
45-64 years 90,198 13.2% 34.4% 9.9% 12.3% 30.3%
65-74 years 21,291 24.3% 54.2% 20.4% 22% 49%
75 years+ 17,401 37.1% 57.3% 27.2% 21.7% 54.1%
National Hospital Discharge Survey: 2007 Summary
http://www.cdc.gov/nchs/data/nhsr/nhsr029.pdf
Hospital discharges 2007 (numbers in thousands)
Code:
Diseases of Genito- Surgical
All Malignant Heart Digestive Respiratory urinary Osteo- Medical Mental
Conditions Neoplasms Disease System Diseases system arthritis Complications Disorders
14-44 years 10,571 116 250 819 332 523 18 186 1,251
45-64 years 8,753 484 1,205 1,040 781 550 271 336 743
65+ years 12,863 596 2,493 1,229 1,641 947 429 355 244
Deaths: Final Data for 2007
http://www.cdc.gov/NCHS/data/nvsr/nvsr58/nvsr58_19.pdf
Code:
Percent
of total
Rank Cause of death Number deaths
. . . All causes 2,423,712 100.0
1 Diseases of heart 616,067 25.4
2 Malignant neoplasms 562,875 23.2
3 Cerebrovascular diseases 135,952 5.6
4 Chronic lower respiratory diseases 127,924 5.3
5 Accidents (unintentional injuries) 123,706 5.1
6 Alzheimer’s disease 74,632 3.1
7 Diabetes mellitus 71,382 2.9
8 Influenza and pneumonia 52,717 2.2
9 Nephritis, nephrotic syndrome and
nephrosis 46,448 1.9
10 Septicemia 34,828 1.4
11 Intentional self-harm (suicide) 34,598 1.4
12 Chronic liver disease and cirrhosis 29,165 1.2
13 Essential hypertension and
hypertensive renal disease 23,965 1.0
14 Parkinson’s disease 20,058 0.8
15 Assault (homicide) 18,361 0.8
. . . All other causes 451,034 18.6
Note that this table omits iatrogenic deaths - perhaps they're included in "accidents". The document doesn't mention it in the notes at all unless they've used another term that I haven't time to search for.
The age-related stats indicate the cumulative impact of lifestyle which in the USA includes the standard, high-fat, high-protein and high-sugar diet as well as well as a lifetime of vaccination, medicinal drugs (OTC or prescription) and alcohol, tobacco and the abuse of other recreational drug.
It's high time that the alternative health people had a go to see what stats they can produce after 100 years or more with a monopoly on health care. The current lot are keeping very busy treating disease but neither curing nor preventing it.
As a final general comment in this post, a lot of fuss is made about natural health people using the medical facilities for trauma and emergency treatment and there are times when a good surgeon is indispensable. If I had a choice, I would always choose a Natural Hygiene-trained surgeon or emergency doctor for these purposes but, of course, there aren't any because of the medical industry's monopoly on health care provision. So don't knock us for resorting to the only care providers available when required!