Health Care in Your 70s: Screening and Prevention Checklist

Health Care in Your 70s: Fucoidan and Immunity

Do your steps feel less light than they used to, do stairs feel like a burden, or does it take longer to recover after a tiring day? In your 70s, strength, balance, and immune responses often change together. These are natural changes that come with age, not a specific disease. Still, this is a good time to review your routine checkups, physical activity, and nutrition all at once, which can go a long way toward keeping you active in daily life.

Screening and Prevention Checklist Based on the U.S. Preventive Services Task Force (USPSTF)

Below are USPSTF recommendations relevant to people in their 70s. Whether a screening applies to you depends on your smoking history, family history, and overall health, so decide together with your primary care doctor.

● Exercise to prevent falls (Grade B): Exercise programs are recommended for community-dwelling adults age 65 and older who are at increased risk of falls.

● Osteoporosis screening (Grade B): Screening is recommended for women age 65 and older. For men, the evidence is currently insufficient, so talk with your doctor about your individual situation. (Final recommendation, January 2025)

● Colorectal cancer screening: Screening is recommended from age 50 to 75 (Grade A). For ages 76 to 85, screening is offered selectively, taking into account your health and prior screening history (Grade C).

● Lung cancer screening (Grade B): For adults age 50 to 80 who have a smoking history of at least 20 pack-years and currently smoke or quit within the past 15 years, annual low-dose CT screening is recommended.

● Abdominal aortic aneurysm screening (Grade B): Men age 65 to 75 who have ever smoked are recommended to have a one-time ultrasound.

Checking Your Nutrition in Your 70s

As we age, we tend to eat less and our bodies may absorb nutrients differently. Before starting any supplement, it is worth checking the items below against your diet and lab results.

Item to check	What to know in your 70s
Protein	The 2025 to 2030 Dietary Guidelines for Americans recommend 1.2 to 1.6 g of protein per kg of body weight per day for adults. For a person weighing 70 kg, that is about 84 to 112 g per day. If you need a modified diet because of kidney disease or another condition, talk with your doctor first.
Vitamin D	The National Institutes of Health (NIH) Recommended Dietary Allowance for adults 70 and older is 20 mcg (800 IU) per day, with an upper limit of 100 mcg (4,000 IU). With age, the skin makes less vitamin D and time outdoors often decreases, so decide with your doctor whether to supplement, based on a blood test.
Vitamin B12	The recommended daily amount is 2.4 mcg. With age, stomach acid and intrinsic factor decrease, which can reduce absorption of B12 from food. Fortified foods such as fortified cereals, or supplements, may be options, so review your diet and then talk with your doctor.

Fucoidan and Immunity

Fucoidan, a polysaccharide extracted from seaweed, has drawn attention for its connection to immune function. Below is a summary of research on fucoidan and immunity.

In a study published in Marine Drugs in 2019 (Yoo et al., Mar Drugs 2019, 17(8):447, https://doi.org/10.3390/md17080447), mice (BALB/c) whose immune function had been lowered with a drug were given a high molecular weight fucoidan derived from Undaria pinnatifida sporophyll by mouth for about four weeks. In these mice, the activity of natural killer (NK) cells and the release of granzyme B (a protein used by NK cells), both of which had dropped, recovered to the level of normal control mice. The gene expression of some immune-related cytokines also tended to recover. These are the results of an animal study, and further studies in humans are needed.

When to Talk With Your Doctor Before Taking Fucoidan

● If you have a bleeding disorder or take blood thinners: Seaweed extracts may have a mild natural blood-thinning effect, so if you take medications such as warfarin or aspirin, you should talk with your doctor before use.

● If you have a seaweed allergy: People with a seaweed allergy should use caution.

● If you take several medications: It is common to take many medications in your 70s, so before starting any new dietary supplement, show your pharmacist or doctor your full list of medications.

Fucoidan: What to Check When Choosing a Product

The quality of fucoidan products varies widely depending on the type of brown seaweed used, its origin, and purity. Rather than relying on advertising claims, we recommend checking the items below directly on the label.

Item to check	Why it matters
Type of brown seaweed	Each source, such as mozuku, mekabu (wakame sporophyll), and fucus, has a different polysaccharide structure, so to optimize effectiveness, a product that blends two to three types of brown seaweed may be better.
Actual content	Check that the label shows the net fucoidan content, not just the total amount of 'fucoidan extract.'
Origin of the seaweed	Depending on how well the water quality is managed in the harvest area, residues of contaminants such as heavy metals can differ, so it is a good idea to check the origin for safety.
High purity (85% or higher)	Purity of 85% or higher is needed for the product's effectiveness to be reliable.

Labeled content and product specifications may vary by manufacturer and over time, so check the most recent label and ingredient list yourself before purchasing.

Conclusion

Your 70s are a time when keeping your balance matters more than ever. Keep up with routine checkups, make exercise for strength and balance and adequate protein intake your foundation, and then, if needed, supplementing with an ingredient under active research can be one option. Above all, the care you need depends on your health and the medications you take, so we recommend talking with your doctor first.