Seafood provides a good source of protein but gluttony is a disordered appetite

2 Peter 1:5-7 - Make every effort to supplement your faith with virtue, virtue with knowledge, knowledge with self-control, SELF-CONTROL with endurance, endurance with devotion, devotion with mutual affection, mutual affection with love 

Seafood provides a good source of protein, but contains less fat than other animal protein sources.

It is generally low in cholesterol, which is important for heart health.

It’s rich in vitamins and minerals including iodine, zinc, potassium, and vitamin B.

One of its  major seafood health benefits comes from their abundance of Omega-3 fatty acids, a type of polyunsaturated fat.

These Omega-3 fats have some anti-inflammatory properties, and these can work against an excess of Omega-6 fatty acids, which are found in vegetable oils and some seeds.

Omega-6 fats are essential nutrients found in most vegetable oils, made from plants like sunflower, sesame, and corn.

However, consuming too much of these Omega-6 fats can promote inflammation in the body, which is associated with diseases like arthritis, and inflammatory diseases like asthma.

Conversely, Omega-3 fats found in seafood can help counter this negative effect.

Once not an eater of a seafood, avoiding bad fats becomes even more significant.

If a vegetarian, it's probably a good idea to use olive oil or canola oil as cooking oil which are not high in the Omega-6 fatty acids.”

Linseeds, chia seeds, walnuts and soybeans are vegetarian sources of some Omega-3 fats but seafood is the most common source.

Swordfish, salmon, mackerel, sardines have much higher levels of the Omega-3 fatty acids.

One does not need to eat that much seafood to get its health benefits - eat from one-point-four to two-point-eight servings of fish per week, about 140 to 280 grams of fish per week (for adult) and proportionally less for adolescents and children- eating significantly more seafood than the recommended doesn't seem have any advantage.  In fact, it’s a sin.

Gluttony is a disordered appetite (obsession either by excess or defect) - Catechism of the Catholic Church CCC #1866.  Food is for the body, but the body is not the center of life. Eating excessively can mask a spiritual hunger that only God can gratify.