A longitudinal study of nutritional intake in men

Area of Science:

• Gerontology
• Nutritional Science
• Epidemiology

Background:

• The Baltimore Longitudinal Study of Aging (BLSA) provided data on dietary habits.
• Participants were highly educated, upper-middle-class men aged 35-74 at the study's start.
• Dietary data were collected over three distinct time periods between 1961 and 1975.

Purpose of the Study:

• To analyze the effects of aging, cohort, and time on the dietary intake of specific nutrients.
• To understand how diet changes in men over their lifespan.
• To identify trends in nutrient consumption within a specific demographic group.

Main Methods:

• Utilized a combination of cross-sectional, longitudinal, and time-series research designs.
• Analyzed seven-day dietary diaries from 180 male participants.
• Examined intake of calories, protein, carbohydrate, fat, saturated fatty acids, polyunsaturated fatty acids, and cholesterol.

Main Results:

• Aging was associated with decreased intake of calories, fat, saturated fatty acids, and cholesterol.
• No significant cohort effects were observed for any of the studied nutrients.
• Over the study period, carbohydrate and cholesterol intake declined, while polyunsaturated fatty acid intake increased.

Conclusions:

• Aging significantly affects dietary intake patterns, particularly reducing consumption of energy, fat, and cholesterol.
• Dietary trends over time show a shift towards healthier fats (polyunsaturated fatty acids) and away from carbohydrates and cholesterol.
• These findings contribute to understanding long-term nutritional changes in aging populations.