Gelatin is a very incomplete protein, missing essential amino acids and containing a high percentage those which the body makes.
Gelatin is one of the few foods which, when eaten in quantity will cause loss of protein in the body. There were some serious health problems ande ven death what those liquid diets were popular in the 70's.
I sure would not routinely add an envelop of gelatin to a daily food. Add dry milk instead, it contains a complete protein and adds to the flavor.
The only reason I can think of to eat gelatin is if you like jiggley desserts or marshmallows.
Linda C

America's Test Kitchen recently had an episode where they added gelatin to vegetable beef soup to replicate the body you get when you simmer shank(?) bones all day which release collagen and thicken the soup. Here's the recipe.
ATK Vegetable Beef Soup
1 pound sirloin tip steaks , trimmed of excess fat and cut into 1/2-inch pieces (see note above)
2 tablespoons soy sauce
1 teaspoon vegetable oil
1 pound cremini mushrooms , stems trimmed, caps wiped clean and quartered
1 large onion , chopped medium (about 1 1/2 cups)
2 tablespoons tomato paste
1 medium garlic clove , minced or pressed through a garlic press (about 1 teaspoon)
1/2 cup red wine
4 cups beef broth (see note above)
1 3/4 cups low-sodium chicken broth
4 medium carrots , peeled and cut into 1/2-inch pieces (about 2 cups)
2 medium ribs celery , cut into 1/2-inch pieces (about 3/4 cup)
1 bay leaf
1 tablespoon unflavored gelatin (powdered)
1/2 cup cold water
2 tablespoons minced fresh parsley leaves
Table salt and ground black pepper

1. Combine beef and soy sauce in medium bowl; set aside for 15 minutes.

2. Heat oil in large Dutch oven over medium-high heat until just smoking. Add mushrooms and onion; cook, stirring frequently, until onion pieces are brown and dark bits form on pan bottom, 8 to 12 minutes. Transfer vegetables to bowl.

3. Add beef and cook, stirring occasionally, until liquid evaporates and meat starts to brown, 6 to 10 minutes. Add tomato paste and garlic; cook, stirring constantly, until aromatic, about 30 seconds. Add red wine, scraping bottom of pot with wooden spoon to loosen browned bits, and cook until syrupy, 1 to 2 minutes.

4. Add beef broth, chicken broth, carrots, celery, bay leaf, and browned mushrooms and onion; bring to boil. Reduce heat to low, cover, and simmer until vegetables and meat are tender, 25 to 30 minutes. While soup is simmering, sprinkle gelatin over cold water and let stand.

5. When soup is finished, turn off heat. Remove bay leaf. Add gelatin mixture and stir until completely dissolved. Stir in parsley; adjust seasonings with salt and pepper, and serve.

I cannot imagine what difference 1 tablespoon of gelatin could possibly make in that amount of soup...
And I know this thread isn't abiout sodium...but I would like to know what the estimated sodium content of that soup might be per serving.